It's going to rain here in a few hours, and I have some touchup painting to do on trim (with the semi-gloss paint). And some touch-up to do with regular exterior flat siding paint. If I paint now, before the rain, and it rains in say 4 hours, is this going to be a problem? That is, will the paint be okay, or will it be ruined?

Or do I need to wait until I have like 24 hours without rain? What I'm asking is what's the minimum time between painting and rain to get reasonable results?

Thanks very much.