Did full time course in London, same time as work, newborn baby and wife, it took 6 months, but that was because of doing the full time course.
Distance learning, yes it is possible, but if your work is 12 hours, 5 days a week, that will be all you have for yourself, there will be little time for girlfriend/wife or friends, promise you that, you social life will be over until completed most of it.
I know of guys who spent 12 - 18 months, which seems to be the average time, but they only got really going when their girlfriends went away on holiday or work for longer periods!
Good luck anyway, anything is possible!