Thirteen days, two hours and forty three minutes as of this moment. It seems high to me, but then I cheat. I will often leave a couple of pages open all day long and refresh the Recent Posts page continually, while I'm putterring around the house or listening to music.
Now the time counter on my music is what's really out of proportion. Take my age and subtract about eighteen or twenty years. I rarely turn off my music, since I became an adult.