Uh sorry to be the bearer of bad news but i'm pretty sure you loose all that exp... or it doesn't save unless you start playing another session before getting off the game. at least that's been my experience each time I check my battlelog after something like that happens. Less it was fixed in the last patch
Hated it. It was attached to an afternoon class so i was always tired and starving after wards... ended up dropping cuz dinner seemed more important after awhile...
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