An Even Longer Day

I'm trying to get enough done this week so that I can take a trip back up to Ames to visit some friends and family. Unfortunately, to do that, I have to be far enough along in my work that I can get to the stopping point that makes the most sense. So... today has already been a long day, but it's not even close to done. It's been 11 hours in the lab and I'm about to start what would be equivalent to the next day's work. If I can plug through the work I need to finish tonight, I will get (as a reward) almost two more whole days away from the lab. What? Is that possible? Multiple days away from work in the same month?