I've never pinned anymore than two quilts at once. I get them done relatively fast, so I don't worry about them being pinned for too long and the one that I'm not working on usually drapes over my ironing board to avoid creases. I have three finished twin sized quilt tops. Two of them I need to get finished for Christmas and the other is a quilt top I finished for my DD last Spring, but haven't pinned and quilted yet.
So, here's my question, would it be all right to pin all three quilt tops in one day and then drape two of them over the ironing board until I get to them? I've already left the batting out in the air for 24 hours to allow it to expand.