Really an important question here is how much you expect to get through per session. I ran a group of new players through the Sunless Citadel a couple years ago. Technically, it's just one adventure and only one dungeon. In practice, in the four sessions that the game lasted, they explored less than half of it. If your beginners are about as fast as mine were, a single decent-sized module should fill 5-10 sessions no problem. If Sunless still turns out to be too short, it's only the first part of a whole series of linked adventures that you could run after, the second of which is Forge of Fury.
I'm not coming up with anything that fits the bill of a premade campaign in that range / number of sessions, though; most products billed that way tend to be much, much longer. For something of that form, I'd recommend any of the Pathfinder adventure paths or Lost City of Barakus. The individual modules making up the PF paths, for example, are each supposed to take ~4 sessions, and there are 6 of them per path. One workable approach for you might be to pick up the first two modules from a path and run them back-to-back; that would fall in about the right time range, and the modules do tend to be reasonably compartmentalized, at least at the beginning of the paths, so you could probably achieve closure after the second.