I did two of these this week. The first took maybe 20 minutes. The store did not have a certain wall, but the question was a part of the survey for that store. In order to support why I did not have pictures of that wall, I took several overview photos of the store. I had to wait a few minutes in order to dodge customers and employees.
The second story was SUPER EASY. I walked up to it, and there was a sign on the store stating they were on break. I tried the door, and it was locked, and the lights were off. I snapped a few pictures, and waited for about 15 minutes. Nobody returned, so I moved on to the other 4 shops I had in the same shopping center. If I had more time, I would have circled back but I just couldn't do it.