Yes, if OT is unblocked which rarely is or if is, you do not have the day off. I've been interested in trying to pick up some OT for the past few months. It's never unblocked on a day off, or if it is creates a 7 day conflict or nothing that would work (IE only 3 day trips open and I only have 2 days off). OT on reserve is pretty difficult (but not impossible).