Anyone noticed *when* in the day the refresh happens? Fast requests will refresh in 0 days

I’m guessing “Fast requests will refresh in 0 days” really means sometime in the next 24hrs?
Does anyone know if this is a fixed moment in time (and if yes, when, and what timezone) or do they happen to remember the exact time I purchased my subscription in the past, and use that ?

OK - so I can confirm that the exact moment your “refresh” happens is the same time as in your “Welcome to pro” email you got was sent. In my case, that was 23:07 UTC. Now (23:29UTC) I’m back to fast again!