Do We Need to Feed the Meter?
If you are parked during any part of the time indicated, then you need to pay, even if it's only for a few minutes at the beginning or end of your shopping. (If you only are there for the five minutes between 8:00 and 8:05, you only pay a pro-rated fee.)
If you park at any random time and leave your car there for an hour, are you more likely to pay or more likely to not pay?