I know some mathematicians print all the supporting material they need in advance and then work on paper for weeks without internet. Although admittedly that's

I know some mathematicians print all the supporting material they need in advance and then work on paper for weeks without internet. Although admittedly that's a fringe option. And contrary to the expectation that they will probably need to look up things that come up later, they are actually very productive. (That's just an anecdote from second-hand, as in: I know a mathematician who knows a mathematician who does this.) For my own coding, I usually don't use the internet anyway. I browser offline documentation of the stuff I use, vendor all my libraries (i.e. building doesn't require internet access), so maybe I'm going to try disconnecting my computer during those sessions. That's of course not counting coding at work, due to the tyranny of Slack.