Eight hours, five days a week (M-F), salaried, but every day is different. It comes down to what the client needs and when. On average, in my position as a technical writer, I am basically "on call" from 0630 to 1600 hours, or 9 and a half hours a day. because we have clients in UK, US East Coast, and US West Coast.
I am required to work at least 5 hrs. a week, max 7 hrs. for the week
At your own leisure.