I’m not the most wizened of veterans, but rarely have I seen someone put in a true solid 8 hours of work in a day (excluding 11th hour crunches), and even rarer with any regularity. The norm in my experience, in-office or remote, is 3 hours per day. It’s kind of like the televised broadcast of American football. Add up all the commercials (distractions), commentary (socializing), and stoppage (eating/relieving) and you’re left with a fraction of productivity. Not complaining; everything seems to have worked out just fine.