Something that will consume the entire work day is watching and trying to comprehend the movie Primer. Primer is a movie that came out in 2004 and is about time travel? Honestly, I have no idea what it's about and have seen it several times back to back. I can run through the plot and it still would not give away any spoilers.
Basically these guys make a machine or microwave or something and I think one of them goes back in time? Maybe they both go back in time or something. They're driving in a car at one point. The one guy is married and has a house and stuff and there is a cell phone involved as well. Then it just kind of ends abruptly. I think they try to explain what's going on near the end or maybe not.
Either way, I think it was a pretty good movie and wouldn't mind seeing it again.