The game time that goes by while repairing system slots appears to be about 4 times as much as the repair message says, eg. 10 minutes being displayed will result about 40 minutes passing.
On a related note, maybe now with the changed time scale there'd be more headroom to set different (maximum) times for repairing different slots, some being simpler (such as fuse slots) while others likely more complex (eg. circuit board slots, RTG cradles etc.), maybe in the 10-60 minutes range or so?
Customer support service by UserEcho