I usually try to circle back through and draw my all ocs occasionally. The last time neglected a group of ocs, it took a year and a half before I started drawing them again. But it's been less than a day since I started drawing that group again and I redesigned them. I tend to get bored easily when it comes to drawing characters, even for my comic, so I have to switch to someone else to stay productive, at least from time to time.