I played electric bass for 6 months or so, then rented an upright for 6 months, and then bought an upright. I've been playing about 3.5 years, there's a recording of me here: http://paulsanwald.com/music

Definitely a lot of learning for me, particularly regarding the bow. I went through the George Vance books and they were helpful with the basics.

I was able to start playing professionally on it pretty quickly, though, played my first gig on upright after 6 months of playing. But things like higher thumb positions and soloing with the bow (I'm a jazz musician) are very much a work in progress. Luckily, in jazz you can get a long way just knowing a couple positions.