Worst case is a 1500 hot, 3000hr TBO. That's on the TBM850, but I'm know it's about one of the worst ones because it's a "new" engine and they haven't gotten it extended yet due to low-time airframes. Once they start getting some better hours on the fleet that should go up.

Mx isn't that big of a deal. If there is something wrong, it's usually a warrenty issue from what I've seen come through our shop. We'll occasionally(once a year) have a bad bearing or seal, but that's not the norm.