If a slide is awarded, you could have held those days off anyway. I'm not sure of your seat seniority, but just keep in mind that slides are not looked at if you're subject to coverage. If you're going to attempt a slide, as a backup, be sure to ask for those days off (maybe with an else start next). If the slide is awarded, no big deal, if it's denied, you'll at least have a shot at getting as many of those days off as possible.