I was thinking about something similar yesterday..
My gf and I spent almost the entire day on the beach... from 12pm to 7pm. 7 hours!!
I work 6 hours at my job .. the time at the beach felt like 10 mins compared to work.
I know what you mean....when I'm having sex with my wife it i tell my friends it went for hours but tells people minutes ....who knows who to believe?