Lawsuits in PA

Does anyone know how long you have to respond if a suit is filed in Pennsylvania? I have had a rough time dealign with Asset Acceptance. I'm not sure if they have even done anything but my mail has been on hold since July 30th (long story) and I won't be able to get mail again until Saturday. I'm not even sure if anything happened but I don't want to have missed my chance...I read on here they attempt to get a lot of default judgments.