The attack and release times were measured on each of three samples of 27 different models of compression‐type hearing aids using the test conditions specified in ANSI Standard S3‐22 (1976). The results indicate that almost all of the hearing aids tested have attack times less than or equal to 10 ms. A little more than half of the hearing aids had release times of 50 ms or less. The range of the attack times varied from 1 to 23 ms and the release times from 5–600 ms.