Congratulations! It sounds like things are going well for you so far - even playing Uno with the grandkids!
When I had my subtalar joint fused I was first in a splint and then in a cast once my stitches were out. I don't remember how many weeks I was in a cast, but I moved fairly quick into a boot (4-6 weeks).
Funny how each doc is different in their post op protocol. Your plan may be different due to the other work you had done or my doc may just be more conservative - he tends to be that way.
I am curious to know why you had the additional procedures besides the subtalar fusion.