[ravenfish]

I think "game-time" versus "play-time" are not dramatically unbalanced (and they are certainly listed in Powers as per-advantage options rather than per-game options). When a few minutes of infiltration and fighting drag out into an hour at the table, the player who took game-time on his Luck will look enviously at the one who didn't; when a month of travel speeds by in a few minutes, the player who took unmodified luck will look on enviously as the one who took game-time uses Luck on every navigation and survival roll. It strikes me as reasonable.