Yes, I am talking exactly about a real rescue and after rechecking no, you are wrong - the rescue is pretty much a guaranteed success without any save scumming at all and requires only one roll (when encountering the pair of orcs). If you fail it, let them feel Delane up - it has a small 2 point corruption penalty, which is compensated by the corruption reduction from completing the rescue. All in all 6 weeks from the time you first set foot in the camp to the completion of the rescue, even if you fail a couple of rolls during exploration. That's with version 0.2.57 of the game, assuming that you do all the steps I mentioned before.
As for Delane's fate, she leaves Rastedel after you warn her about the impending attack, but not before you have some fun with her. Speaking of which, my main disappointment with the game is that Alexia's back entrance seems to be reserved for demon cock, even though we know that Rowan is a kinky little bastard after he makes his needs quite clear to Delane, Liurial, and the fangirl sorceress. Must be a case of have babies with the wife (which is a plot point), and have fun with other women.