Absolutely. Eventually you sink into the code and forget about the chatter and your shitty laptop keyboard and you can get a lot done. A few hours later, you can come out of it, get some beers, and go back to sitting at your desk for 12 hours a day.

Some software I've written at hackathons:

https://github.com/jrockway/eslide

https://github.com/wjackson/hiredis-raw