I don't have a bandsaw but I will confess to getting a bit mesmerized by the drill press at times. At which point I seem to lean in closer and closer... not good. I don't ever recall having had a chip hit my safety glasses or even my cheek, but they have aimed directly for my lip a couple times. (It
smarts and makes it look like you have a nasty cold sore for a few days :grumpy: )
Anyway, I agree with Greg; I find it best to break up the day and not spend more than an hour or two doing the same thing over and over. I usually have enough unfinished projects going that this doesn't present a problem.