While watching some let's play videos from some Japanese people, I noticed I only see one racoon (or tanuki if you're in Japan) running the Nookling Stores. You can see it here:
View attachment 3968
They work alternate days/shifts.
Just to add, this then changes when you get the final store upgrade, they both work all day.
As a result the stores hours are from 9am to 9pm. (without hour based town ordinances)
I hated Nookington's due to these hours, thankfully in this game, Re-tail is now the place to go if you want to sell things.