In my experience, e500-sponsored upgrades clear (or waitlist) about 1 hour prior to my window (which is now 100 hrs, but has been 72 hrs and 48 hrs in the past).

For the first time I am now at 99 hrs prior and the upgrade is still 'pending'. It will clear since F is wide-open, but wonder why the computer is late this time.

I guess since the upgrades cleared an hour early so many times in the past, I probably owe them 10 hrs or so?!