Played piano for many years when I was really young (started when I was like 4 or something). I got pretty good by the time I stopped (about 13 or so) taking lessons for it. After that I pretty much just stopped playing, and my skills were gone. I was never great at it, but I could play some really nice rare classical pieces (still know the majority of one of them fairly well).
Years later I picked up the guitar and took lessons for a bit to learn basics. I play guitar quite frequently, but don't really learn too much. I mostly do my own thing, occasionally picking up a tab, but mostly song writing, with fairly simple riffs, sometimes with a bit of singing (but my voice is a little lacking). I'd probably be a lot better at guitar if I structure my playing a little more to learn, rather than just enjoy myself, but I kind of prefer doing what I do.
I wouldn't call what I do practicing, I'd called it playing, and I play quite regularly (maybe average an hour a night or so). When I am not in school or working I play a lot of guitar, but when I get off an 8 hour work day, or finish a day of classes and then have to study or do work, I typically just don't have enough energy to have an extended jam session, so I just play for an hour or so.