I did a shop where I had to count 50 items at a drug store. I wanted to start with a small amount to get a feel for the shop. It took 2 hours and I didn't need to charge my phone.
I drew attention from the manager. I showed my authorization letter and they left me alone.
Some regulated items were behind the register or locked away. I skipped those items, I think.
"I told myself to quit you; but I don't listen to drunks." -Chris Stapleton