diff --git a/tests/cases/standalone/common/flow/basic.result b/tests/cases/standalone/common/flow/basic.result
index 9b8273655e..77f3b8683b 100644
--- a/tests/cases/standalone/common/flow/basic.result
+++ b/tests/cases/standalone/common/flow/basic.result
@@ -14,6 +14,7 @@ SELECT sum(number) FROM numbers_input GROUP BY tumble(ts, '1 second', '2021-07-0
 
 Affected Rows: 0
 
+-- SQLNESS SLEEP 500ms
 INSERT INTO numbers_input 
 VALUES
     (20, "2021-07-01 00:00:00.200"),
@@ -30,6 +31,7 @@ SELECT col_0, window_start, window_end FROM out_num_cnt;
 | 42    | 2021-07-01T00:00:00 | 2021-07-01T00:00:01 |
 +-------+---------------------+---------------------+
 
+-- SQLNESS SLEEP 500ms
 INSERT INTO numbers_input 
 VALUES
     (23,"2021-07-01 00:00:01.000"),
@@ -37,7 +39,7 @@ VALUES
 
 Affected Rows: 2
 
--- SQLNESS SLEEP 2s
+-- SQLNESS SLEEP 3s
 SELECT col_0, window_start, window_end FROM out_num_cnt;
 
 +-------+---------------------+---------------------+
diff --git a/tests/cases/standalone/common/flow/basic.sql b/tests/cases/standalone/common/flow/basic.sql
index d7beba69ce..ddef6cff9f 100644
--- a/tests/cases/standalone/common/flow/basic.sql
+++ b/tests/cases/standalone/common/flow/basic.sql
@@ -10,6 +10,7 @@ SINK TO out_num_cnt
 AS 
 SELECT sum(number) FROM numbers_input GROUP BY tumble(ts, '1 second', '2021-07-01 00:00:00');
 
+-- SQLNESS SLEEP 500ms
 INSERT INTO numbers_input 
 VALUES
     (20, "2021-07-01 00:00:00.200"),
@@ -18,12 +19,13 @@ VALUES
 -- SQLNESS SLEEP 3s
 SELECT col_0, window_start, window_end FROM out_num_cnt;
 
+-- SQLNESS SLEEP 500ms
 INSERT INTO numbers_input 
 VALUES
     (23,"2021-07-01 00:00:01.000"),
     (24,"2021-07-01 00:00:01.500");
 
--- SQLNESS SLEEP 2s
+-- SQLNESS SLEEP 3s
 SELECT col_0, window_start, window_end FROM out_num_cnt;
 
 DROP FLOW test_numbers;
diff --git a/tests/cases/standalone/common/flow/df_func.result b/tests/cases/standalone/common/flow/df_func.result
index 6c08f7854e..9f209a33da 100644
--- a/tests/cases/standalone/common/flow/df_func.result
+++ b/tests/cases/standalone/common/flow/df_func.result
@@ -15,6 +15,7 @@ SELECT sum(abs(number)) FROM numbers_input_df_func GROUP BY tumble(ts, '1 second
 
 Affected Rows: 0
 
+-- SQLNESS SLEEP 500ms
 INSERT INTO numbers_input_df_func 
 VALUES
     (-20, "2021-07-01 00:00:00.200"),
@@ -32,6 +33,7 @@ SELECT col_0, window_start, window_end FROM out_num_cnt_df_func;
 | 42    | 2021-07-01T00:00:00 | 2021-07-01T00:00:01 |
 +-------+---------------------+---------------------+
 
+-- SQLNESS SLEEP 500ms
 INSERT INTO numbers_input_df_func 
 VALUES
     (23,"2021-07-01 00:00:01.000"),
@@ -39,7 +41,7 @@ VALUES
 
 Affected Rows: 2
 
--- SQLNESS SLEEP 2s
+-- SQLNESS SLEEP 3s
 SELECT col_0, window_start, window_end FROM out_num_cnt_df_func;
 
 +-------+---------------------+---------------------+
@@ -78,6 +80,7 @@ SELECT abs(sum(number)) FROM numbers_input_df_func GROUP BY tumble(ts, '1 second
 
 Affected Rows: 0
 
+-- SQLNESS SLEEP 500ms
 INSERT INTO numbers_input_df_func 
 VALUES
     (-20, "2021-07-01 00:00:00.200"),
@@ -95,6 +98,7 @@ SELECT col_0, window_start, window_end FROM out_num_cnt_df_func;
 | 2     | 2021-07-01T00:00:00 | 2021-07-01T00:00:01 |
 +-------+---------------------+---------------------+
 
+-- SQLNESS SLEEP 500ms
 INSERT INTO numbers_input_df_func 
 VALUES
     (23,"2021-07-01 00:00:01.000"),
@@ -102,7 +106,7 @@ VALUES
 
 Affected Rows: 2
 
--- SQLNESS SLEEP 2s
+-- SQLNESS SLEEP 3s
 SELECT col_0, window_start, window_end FROM out_num_cnt_df_func;
 
 +-------+---------------------+---------------------+
@@ -141,6 +145,7 @@ SELECT max(number) - min(number), date_bin(INTERVAL '1 second', ts, '2021-07-01
 
 Affected Rows: 0
 
+-- SQLNESS SLEEP 500ms
 INSERT INTO numbers_input 
 VALUES
     (20, "2021-07-01 00:00:00.200"),
@@ -157,6 +162,7 @@ SELECT col_0, col_1 FROM out_num_cnt;
 | 2     | 2021-07-01T00:00:00 |
 +-------+---------------------+
 
+-- SQLNESS SLEEP 500ms
 INSERT INTO numbers_input 
 VALUES
     (23,"2021-07-01 00:00:01.000"),
@@ -164,7 +170,7 @@ VALUES
 
 Affected Rows: 2
 
--- SQLNESS SLEEP 2s
+-- SQLNESS SLEEP 3s
 SELECT col_0, col_1 FROM out_num_cnt;
 
 +-------+---------------------+
@@ -203,6 +209,7 @@ SELECT date_trunc('second', ts), sum(number) FROM numbers_input GROUP BY date_tr
 
 Affected Rows: 0
 
+-- SQLNESS SLEEP 500ms
 INSERT INTO numbers_input 
 VALUES
     (20, "2021-07-01 00:00:00.200"),
@@ -219,6 +226,7 @@ SELECT col_0, col_1 FROM out_num_cnt;
 | 2021-07-01T00:00:00 | 42    |
 +---------------------+-------+
 
+-- SQLNESS SLEEP 500ms
 INSERT INTO numbers_input 
 VALUES
     (23,"2021-07-01 00:00:01.000"),
@@ -226,7 +234,7 @@ VALUES
 
 Affected Rows: 2
 
--- SQLNESS SLEEP 2s
+-- SQLNESS SLEEP 3s
 SELECT col_0, col_1 FROM out_num_cnt;
 
 +---------------------+-------+
diff --git a/tests/cases/standalone/common/flow/df_func.sql b/tests/cases/standalone/common/flow/df_func.sql
index e04d95e477..b3c035a120 100644
--- a/tests/cases/standalone/common/flow/df_func.sql
+++ b/tests/cases/standalone/common/flow/df_func.sql
@@ -11,6 +11,7 @@ SINK TO out_num_cnt_df_func
 AS 
 SELECT sum(abs(number)) FROM numbers_input_df_func GROUP BY tumble(ts, '1 second', '2021-07-01 00:00:00');
 
+-- SQLNESS SLEEP 500ms
 INSERT INTO numbers_input_df_func 
 VALUES
     (-20, "2021-07-01 00:00:00.200"),
@@ -20,12 +21,13 @@ VALUES
 -- SQLNESS SLEEP 3s
 SELECT col_0, window_start, window_end FROM out_num_cnt_df_func;
 
+-- SQLNESS SLEEP 500ms
 INSERT INTO numbers_input_df_func 
 VALUES
     (23,"2021-07-01 00:00:01.000"),
     (-24,"2021-07-01 00:00:01.500");
 
--- SQLNESS SLEEP 2s
+-- SQLNESS SLEEP 3s
 SELECT col_0, window_start, window_end FROM out_num_cnt_df_func;
 
 DROP FLOW test_numbers_df_func;
@@ -45,6 +47,7 @@ SINK TO out_num_cnt_df_func
 AS 
 SELECT abs(sum(number)) FROM numbers_input_df_func GROUP BY tumble(ts, '1 second', '2021-07-01 00:00:00');
 
+-- SQLNESS SLEEP 500ms
 INSERT INTO numbers_input_df_func 
 VALUES
     (-20, "2021-07-01 00:00:00.200"),
@@ -54,12 +57,13 @@ VALUES
 -- SQLNESS SLEEP 3s
 SELECT col_0, window_start, window_end FROM out_num_cnt_df_func;
 
+-- SQLNESS SLEEP 500ms
 INSERT INTO numbers_input_df_func 
 VALUES
     (23,"2021-07-01 00:00:01.000"),
     (-24,"2021-07-01 00:00:01.500");
 
--- SQLNESS SLEEP 2s
+-- SQLNESS SLEEP 3s
 SELECT col_0, window_start, window_end FROM out_num_cnt_df_func;
 
 DROP FLOW test_numbers_df_func;
@@ -79,6 +83,7 @@ SINK TO out_num_cnt
 AS 
 SELECT max(number) - min(number), date_bin(INTERVAL '1 second', ts, '2021-07-01 00:00:00'::TimestampNanosecond) FROM numbers_input GROUP BY date_bin(INTERVAL '1 second', ts, '2021-07-01 00:00:00'::TimestampNanosecond);
 
+-- SQLNESS SLEEP 500ms
 INSERT INTO numbers_input 
 VALUES
     (20, "2021-07-01 00:00:00.200"),
@@ -87,12 +92,13 @@ VALUES
 -- SQLNESS SLEEP 3s
 SELECT col_0, col_1 FROM out_num_cnt;
 
+-- SQLNESS SLEEP 500ms
 INSERT INTO numbers_input 
 VALUES
     (23,"2021-07-01 00:00:01.000"),
     (24,"2021-07-01 00:00:01.500");
 
--- SQLNESS SLEEP 2s
+-- SQLNESS SLEEP 3s
 SELECT col_0, col_1 FROM out_num_cnt;
 
 DROP FLOW test_numbers;
@@ -113,6 +119,7 @@ SINK TO out_num_cnt
 AS 
 SELECT date_trunc('second', ts), sum(number) FROM numbers_input GROUP BY date_trunc('second', ts);
 
+-- SQLNESS SLEEP 500ms
 INSERT INTO numbers_input 
 VALUES
     (20, "2021-07-01 00:00:00.200"),
@@ -121,12 +128,13 @@ VALUES
 -- SQLNESS SLEEP 3s
 SELECT col_0, col_1 FROM out_num_cnt;
 
+-- SQLNESS SLEEP 500ms
 INSERT INTO numbers_input 
 VALUES
     (23,"2021-07-01 00:00:01.000"),
     (24,"2021-07-01 00:00:01.500");
 
--- SQLNESS SLEEP 2s
+-- SQLNESS SLEEP 3s
 SELECT col_0, col_1 FROM out_num_cnt;
 
 DROP FLOW test_numbers;