What's everyone's house rules for talents that specified they could only be used once per session inside a pbp game?

It obviously will vary from game to game, but in my experience, GMs tend to call a "session" after three or four encounters. They give XP, roll for Obligation, Duty, or Morality, and reset any once-per-session talents at that time. With the pace of PbP, though, this can still mean weeks of real-world time (or longer) before the talent can be used again, but such is the nature of the beast.

Thanks for input Bob!