If you are referring to MediaWiki:Common.js, you should allow for the standard 2-3 US business days. If you are referring to User:Anylist_Amethyst/common.js, there is no review period.
I’m referring to MediaWiki.
The yeah, the wait time will depend, since your submission is in a waiting line (first come, first serve). It may take a few days to a few hours. The Fandom review team intends reviews to be a speedy process, not to get in the way of useful JavaScript.
All the best