Hundreds of shops under my belt and this still drives me crazy. Today it was a computer system that insists if I entered at 12:35 and exited at 12:39 then the max. time to complete my transaction must be less than four minutes, not the four min 11 seconds it actually took. I had the same issue two days ago with a different MSC report. If you want measurements to the second then keep everything to the second... ugh... OK rant over
It can be a pain because no times seem to line up. My watch might not match the receipt time so the start/stop times I do can be complete skewed because of receipt. I have to adjust as much as I can but if it's completely wrong, I email the MSC to let them know. They advise me from there.