I too, have several going at once. If one has a definite deadline, then that's the one I'll concentrate on until it's finished. Otherwise, I'll work on whatever suits my fancy. I for sure, have lots of fabric (12 hunks) bought for OBW's, that have no specific timeline to be made, other than I loved the fabric and had to have it. After finishing a large quilt, it's nice to do some small things - like table runners, placemats, etc. and get those out of my head, so I can then go back to a large project's planning.