American here. To claim that something takes me half a day, I would usually interpret that as half a working day, so 4-5 hours. I brew beer, and I tell people t

American here. To claim that something takes me half a day, I would usually interpret that as half a working day, so 4-5 hours. I brew beer, and I tell people that "beer brewing takes a full day" -- if I start brewing at 8:30 then I get done before 5. Yeah I could do some other stuff afterwards. Oh, and it's "organ-eh-zation" through and through. :)