No.
Me 3 hours inactive
You ain't that lucky
I can be doing a batch of listings, and after the 3 hours it seems to log me out between doing the title and choosing the photo.
So I'm actually active at the time of being logged in to be logged out after the 3 hours ish of the system logging me out.
The way you could test this to replicate is have 2 google chrome tabs open, enter the title in tab one, log out in tab 2, go back to tab 1 and then choose picture, you should then see what I mean about not loading a picture, nor giving the log in page