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This article is from the MPEG FAQ, by Frank Gadegast phade@cs.tu-berlin.de with numerous contributions by others.

52 Quality, complexity - what about the codec delay? (MPEG Audio Layer-3 Applications)

Well, the standard gives some figures of the theoretical minimum delay:
Layer-1: 19 ms (<50 ms)
Layer-2: 35 ms (100 ms)
Layer-3: 59 ms (150 ms)
The practical values are significantly above that. As they depend on the
implementation, exact figures are hard to give. So the figures in brackets
are just rough thumb values - real codecs may show significant higher
values.

 

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