Well, I'm pretty new to this, having only clocked two batches of 50 hours play into it, and never above level 17, since I'm an incurable altoholic. From what I've been able to glean from various forums, and reading the company line, is that "instance dungeons" are one of the main "high points" later in the game in terms of both drops and "fun". Has this been your experience?

How long does an instance dungeon typically take to complete?

Is there any reward for bugging out before you complete one? (presumably you'd get a few nice drops, or whatever, from the high level goons you kill along the way, but wouldn't get any kind of "quest completion" reward).

For those who are familiar with Diablo 2, are they anything like the ancients quest where you have to complete one without returning to town? I suppose in a game like this, returning to town and then back to the dungeon would be a time consuming process anyway. Are they sort of like ironman games where you have to get to the end with only the initial group of players that gathered for the group? I'm guessing the answer is "yes" for this last part, being instanced and all.

Can an instance dungeon be realistially soloed, in your experience, and if so, could it be done with a character that isn't heavily twinked, or they purely designed to a group only?

I'm very interested in hearing your own experiences with instances, as I'm very much in the "should I bother renewing my subscription?" phase at the moment, and I've been told the game gets "better" late on, without really getting any specifics on how it gets better.