I write best in small dozes. After 30-40 minutes I take a break, 5 -10 minutes of TV or cooking or reading. When I come back I read what I have written and usually there is changing and tweaking of the previous stuff.

There are exceptions. Sometimes I have the whole plot till the end right there, with many details already in place- so I type as fast as I can. But the longest I have continuously written is still not so much- a little under 2 hours.

Felt like sharing after reading your post @galenkp . Keep up the creative work- your way!