I remember someone doing an experiment saving git branches every time he saved in his editor, which would give you some estimate into this: http://www.jukie.ne

I remember someone doing an experiment saving git branches every time he saved in his editor, which would give you some estimate into this: http://www.jukie.net/bart/blog/save-everything-with-git-wip http://www.jukie.net/bart/blog/save-everything-with-git-wip But it doesn't look like he describes the result of this experiment.