I think there are only 3 efficiency states for the torpedo rooms:
1) Not enough crew to load torpedoes (approx 1/3 of the bar shown or less)
2) Enough crew to load in a very long time (1/3 to 2/3 of the bar shown)
3) Plenty of crew to load in a fast time (2/3 or more shown)
I may be wrong, but I think I've only seen two different time scales for torpedo loading (you can see the time-to-load by mousing over the relevant torpedo in the arming screen, of course). One is around 12 minutes, the other much longer (but I forget how much, maybe 25-30). I've never seen an inbetween time.
I expect the other compartments are the same, with about 3 levels of efficiency (none/low/high). I don't think the game models a continuous efficiency variation in proportion to the size of the green bar. That said, I've no idea what difference the low or high state would make to the engines' performance, so maybe those rooms only have 2 states; enough crew or not enough. For the bridge and sonar/radio room it surely affects the crew's ability to detect contacts, but it's harder to judge the difference and how many states/levels there are.
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