I'm sure Wayne can keep that limiter from being so strict in the off-topic forum area, manolo.
Topless nailed it, Wayne. That's just about exactly the problem I run into from time to time, but more frequently than I'd like. Basically, if I forget to click "Preview Post" within a few minutes (easy to forget when writing one of my long-winded responses), I run the risk of getting timed out of the forum. A half hour would be even better, but ultimately I guess it'd be up to you (or a forum poll, perhaps)?