Well my issue isn't that I didn't shadow someone for 20 hours--I did, several doctors. One (that I had the best relationship with) passed away. The other, it's been over a year since I shadowed, and though I called her I wasn't able to get in contact with her. The third I recently shadowed and he agreed to write the letter, but I am being paranoid. If he doesn't come through with the letter, I have no backups that meet the requirement.
The LORs is the worst part of this process--I have the least control over it. I just get to wait and nudge and hope.