My hair is very long. Down to my butt, and has been for quite some time. Yet despite that, I don't think I really have useful advice. It was medium/long (down to the middle of my back, I guess) as a teenager, and my mother used to trim the ends, but when she passed away 15 years ago, I just stopped cutting it for good. Not out of symbolism or anything, just plain laziness. I just let it grow naturally, and it's been at this stable length for probably over a decade now.
I just use regular shampoo + conditioner (not the 2 in 1) and brush fairly regularly. I'll usually spend a few minutes brushing it properly, until it's as nice and smooth as it gets, and freshen up every now and then during the day.
I wash it rather rarely, once every 3 days or so, sometimes less, sometimes more, depending on the condition. I don't mind having slightly greasy hair, but too greasy is gross of course, so if I exercise and sweat a lot I won't skip a day just because, I'll just wash, obviously. I also never, ever use hairdryers. Too lazy. I just sponge it off with a towel for a bit, brush it, towel again, brush it again, then let it dry. I used to occasionally use dryers in the winter, since going outside with wet hair in -25C in Canada is a pain, but I found that annoying. Nowadays I just try to "time" my hairwashing when I won't have to go outside in the winter, heh.
For the longest time I didn't even use conditioner, but I got sick of spending sometimes 10+ minutes untangling knots and breaking hairbrushes handles (I used to break one every year for a while xD), and a friend urged me to use conditioner, and it did make a difference, haven't broken a brush since and it's much easier to maintain, even if it takes longer under the shower. ^^
I should probably note that my hair is very straight, not a single curl whatsoever. It's also very "thin", I don't think I'd keep it that long if it were thick. I do have a lot of split ends because of never trimming, but it appears most people don't notice (or those split ends are not that bad after all) because I routinely get complimented on how good my hair looks. They might just be wowed by the length to notice the rest though. xD
Edit: I guess I wouldn't be out of line in posting a pic? I don't want to show off or anything, I usually never post pics of myself (too paranoid), but since we're on the topic of hair...
I like this one:
Taken in Ephesus, Turkey, 2011. Yes, the ancient city is filled with cats and kittens all over, most of them aren't shy from tourists either and just purr in the sun. Cat lovers should visit Turkey, they're everywhere, and adorable.