P-3 dude here. In an 18 month IDRC, I will have been gone 4 and a half months. That doesn't count the weekends that I flew, stood duty, or had to come into work for random other shit. I may be on a closer to 7 month deployment, depending on when my crew leaves and comes back. I will probably be extended as long as the command can hold onto me. In a nominal 36 month set of orders (which will probably be more like 40ish), I will have been on the road for at least 16 months, assuming I don't go anywhere when we get back, which is not going to happen. I will probably take as many dets as I can steal from Webmastere back next home cycle because I like flying, and it gets me out of mind and sight of home plate.
I've seen Europe, the Middle East, and South America. The only place I haven't been yet is 7th fleet; I'll try to fix that when we get back from deployment. The wife is on board with this stuff, so it makes it easy. It's no different than if I was a jet guy or a helo bubba, except sometimes they pay me really well so I can drink shitty beer in 3rd world countries.