On gag I have a general rule. If the description is written by an anonymous and is long, I avoid it. If it's long but written by a user who's avatar I can see, then I'll bother only if no one else has answered.
Depends on the time of day. There are points in the day where I don't mind reading lengthy things, and there are points in the day where I just want to deal with things that don't require much thought.