Well, it all depends on how much effort your willing to fire into your studies. All in all though, before i decided to go back into education, realistically i was dedicating 70-75 hours each week from getting up in the morning to go to work to when i came back in through the door. I still had a good 5-6 hours to fluff around and do everything else in each day.
But now including travel time and sorting myself out to get ready ect ect, college is up around 19.5 hours. I probably spend around. around 10-12 hours outside of college on it. Now having 11 hours a day free time just well, i`m struggling to fill it to say the least.
Uni i reckon for every hour your in lectures its a good chance you`ll spend another 2 outside of it on your work. So say it takes up a total of 45 hours of your time a week. youv`e still got a good 60 hours to do whatever you want in, work or play.
See if you can arrange a permanent overtime setup with your work place.