I learned on an automatic and it took 15 minutes to become good at driving a standard. It was a Tracker, so it's not like it had any power, but I was doing fine in stop and go traffic without stalling in less than a half hour.
A tracker has a VERY forgiving clutch. I had no idea what I was doing when I got mine and did fine. I learned on an S-10 manual stick, and it was definitely not that easy.
/seconded
I learned on a S-10 stick with power nothing...damn that was a nightmare to learn on, but I can get in anything short of a semi these days without any problem (and most semis are automatic anymore, so that would almost be a non-issue).
I remember in the Army when we were doing licensing-hopped in the duece-and-a-half and the guy was like "You ever driven manual before?" "Sure, I learned on one" "well, OK, so you have an idea, but this is a bit harder to drive than mo..." he cut off at the end there because I stopped listening to him and just drove away, smooth as can be. He didn't bother talking the rest of the time except to tell me where to turn.
For USS-manual trannies WILL last longer than an automatic, as a rule, but only if the people who drove it don't strip the clutch. If you're getting it for your first car, I would seriously find a mechanic you can trust to check it out before you buy, especially at the price ranger you're aiming for.