The problem with these jams is that once you feel serious about it, it’s often an exhausting experience. 48 hours in a month sounds more relaxed but it’s a different feeling. I prefer getting into the tunnel when i feel the need to and also have a little bit of time.
Secondly if you’re new to a tool, or want to introduce people to a new one, you want great docs/online resources next to you as otherwise you’ll spend most of your time trying to figure out how to do something instead of doing it.
Apart from such things it can be fun.