RT60 is a standard measurement used to specify the time it takes for a reverb sound to decay by 60 dB. In general here is a common reference for RT60 times:

SpaceTime
Generic room0.8 seconds (or 800 ms)
Generic medium hall1.2 seconds (or 1200 ms)
Generic large hall2.5 seconds (or 2500 ms)

For example, if you were to clap your hands in a generic large hall and it takes 2.5 seconds for the early reflections to decay to a level of -60 dB, then we can say the RT60 has a time of 2.5 seconds (or 2500 ms).
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Mpumelelo von Mumhanzi
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