Joseph:
Hate to argue, but unless FULL-TIME is way more than yeshiva sdorim, then you can learn a parnossah before, after or between sdorim.
Typical Seder is about 9:15 – 1:00, 3-3:300 to 6-6:30 and 8:00 to 10:00 (if they go to night seder). There is plenty of time in there if you are willing to push yourself. If your sdorim look more like 7:00AM – 1:00, 1:30 – 6:30 (mincha in the middle), 7:30 – 11:30PM then I agree with you.