If you do something like 3 ten hour days, that makes it much less likely that you will drift into working more than you signed up for. Ten hour days are already

If you do something like 3 ten hour days, that makes it much less likely that you will drift into working more than you signed up for. Ten hour days are already longer than the standard 8 (so less social pressure from leaving early or arriving late) and your days out of the office create a bright line that is easier to maintain.