For those saying lass than 8h, how do you handle the office? At home I can happily churn away while in the flow and watch a bit of twitch when recharging, but

For those saying lass than 8h, how do you handle the office? At home I can happily churn away while in the flow and watch a bit of twitch when recharging, but at the office I force myself to stare at work and once the energy is drained the productive part of the day is basically over.