If I'm working-out regularly (cardio or strength training), I need the full 8 hours. If I'm just coding all day/night (to meet a deadline for example) and ignor

If I'm working-out regularly (cardio or strength training), I need the full 8 hours. If I'm just coding all day/night (to meet a deadline for example) and ignoring my health, I can average 4 hours without much of an issue.