Well, I am not a husband, but I am a wife of a MS2 (yeah!!).
Most of what will decide how much time you get together....will be her and her study needs. My hubby does not strive for straight As in order to have time together and time to go out and have fun.
We also didn't have children (though I am prego now), so that meant it was easier for us to go out and party, play, see movies, etc. Honestly, if we had wanted to, we would have had enough time almost nightly to go see a movie.....except during finals.
What he did was give me a schedule of his whole quarter so that I knew when major tests were coming up and could plan on NOT having time right before then. But honestly, we get about as much time together as we did when he was in undergrad.
I am in touch with some of the male spouses, and they mostly say the same thing (except for the one who watches their 3 kids...including twins!).
Good luck......its all priorities but there is fun to be had and I have loved our time in med school so far much more then I thought was possible.
With smiles,
Wifty