Last one I talked to basically confirmed this, that it's credited towards our 75, but we won't go over 75 no matter how long you're in pocket. The only contractual stipulation was that you had to have 2 off following 6 on. We do get per diem while we're there, but you don't get 30 days off it like on a TDY. Just your 'on' days.

They've also been very bad about clearing your schedule so you can pick up open time. Even when asked they told one guy that he wasn't allowed to pick up open time. Obviously he'll win the grievance on that, but just FYI you are allowed to as long as it's prior to MT1 I believe