If the pedal is in Tap Time mode, the delay time will be in mS from 0-3 seconds.

If the pedal is in Tap Tempo mode, the delay time will be note divisions that are synced to the tap tempo.

If you look at the last page of the QRG that may help you understand how it works: https://cdn.eventideaudio.com/uploads/2021/10/MicroPitchDelay-QRG-Web.pdf

You can use the H90 Control app to adjust the pedal parameters and this will tell you the exact delay time values being set: https://www.eventideaudio.com/downloads/?product=H90+Control

Let me know if you have any questions.