In the shop, traffic often fluctuates from all the time by using your POS Software you can get figures for which periods are the busiest and slowest now.
Go to the register > reports.
I suggest that you run this program twice, the first time for the last few weeks and the second time from a previous year that match the dates you are looking for at for this year. You are going here, to get a very detailed report. The part for this exercise you should look at is the part that gives hourly sales reporting statistics.
Now the report is colour coded to show extremely busy periods so busy periods are highlighted.
Using this information, you will be able to increase the control of your business better.