Never had that discussion. When I assign a day to a project, it basically means that I promise to not work on something else on that calendar day. But the actu

Never had that discussion. When I assign a day to a project, it basically means that I promise to not work on something else on that calendar day. But the actual hours don't matter that much if I get some stuff done. I mean regular employees also can have a bad day where they can't concentrate well and then you only get 4 hours of productive work out of the 8 hours they are physically present.