Its been 17 years since I've been thru an A&P school and I had to go to school 7am-3pm mon -fri and then I worked polishing airplanes from 3:30pm-11:45pm monday-friday.
16 hour days for 18 months was tough but that is about the only option if you are already working. Some airlines have had or have some programs that allow want a be mechanics to train over time on all the various areas needed to pass the A&P course along with some class room training but the way the industry is now I don't know how many of those programs exist since there have been more lay offs then hiring in the large carriers.