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A message in the scheduled queue will thus occupy 32 bytes (with metadata unloaded), plus 8 bytes per Message reference. For TimerWheel and SkipList queues, that's just 8 bytes. For SingletonTimerWheel it is 2*8 bytes (one for the queue and one for the singleton wheel). The singleton usage is overall lower though, because the wheel overheads are reduced to a single wheel in that mode.