Good question, it's the toughest thing to find on a web search but it seems like about 4 weeks before a teams first game. Also found this chart from 2020:
Is it odd that this information isn't out there for UConn? Or is it out there and we missed it?
As I mentioned above in the chart I posted above, it said 29 days before the week 0 game, but I finally found it in print from a Uconn beat writers article:
"UConn begins training camp July 29 and opens its regular season at Utah State Aug. 27."