For most of my marriage my DH has worked on a different continent from which we've lived on (he's a geologist). For the first three years of our marriage, he worked away 6 weeks and was then home for 2 weeks (although the six weeks often morphed into seven, eight, or even nine).
Even now he's probably away about 30% of the time. Although I love him and enjoy his company, I've come to realize that I really, really value my "alone" time.