In 15 years I've seen a few people lose medical for almost a whole year, sometimes for a f'in DUI; they were put on admin by default. They would do stuff like 'update charts" (walk the new green books into the tower and approach plates to the tracon), add any new pages to the .65, etc. Basically they chilled in the break room that whole time.
Somewhere in there we got a new ATM and there hasn't been a multiple month DQ since, but there have been at least a few 1-2 week ones where they also did "admin" from the break room.
When I finally got a 1-week DQ the ATM was all, "I don't have any current admin work, I'll have the check with the district to see if they do".