rich49, I think you'll find it's about 14 weeks per module. Most full time schools have 2 modules.
I was "fortunate" in that I didn't have a job and so I could devote all of my time to the 6 months it took to knock off the 14 subjects. As for a relationship? Well, it was a challenge.
If you are in full time employ, you would have to negotiate the time off as leave without pay. I think you'd be lucky to find an employer that will allow that much time off. I guess each situation is different. If your work is seasonal then perhaps they wouldn't mind you taking a block of 3 months off.
Relationships are another matter. You'll have to learn how to juggle your study priorities with enough time off to keep your sanity as well as your partner happy. Effective communication and understanding is the only way.