When I did a grocery store check of approx. 600 items, I wanted to leave after 1-2 hours and return the next day. I can only stand, bend and fend off store employees offering to help for so long. At least there was a cafe there with outlets I could visit between modules. I can't remember the pay. I recently saw an opportunity at a members only warehouse store that I briefly considered. But despite the schedulers note that a membership was not required, I didn't want to lie my way in 3 days in a row. What appealed to me with that one is that I would not be fending off store employees offering to help.
I don't mind these in general. What I found most time consuming, was not the items you can find, it is looking for the items you can't find (they might not even carry the product).