It sounds more like someone was sleeping in.
If you get an email from your boss/manager read it.
If your boss rings and asks for an update don't tell him you didn't read the email until 11 if you start at 8.
Solved.
EDIT: I thought this thread was going to be about outside of work hours but 3 hours to catch an email from your boss during work hours is fairly poor especially if you are sat in front of your computer all day.