Can you return an item at any hr?

Yes

I'm fairly certain that I have returned an item after 10:00pm. I believe it is as another user answered "if there's a C S M there."

No you cannot I believe only up to 9 pm

Yes if there's a C S M there .

At the 24 hour super center yes

It depends from each place you would have to see the schedules on Google.

I called Walmart and you can return items 24/7. Yes, the customer support area closes, but during these off hours you simply need to find a cashier or another active employee and they should be able to help you.

I believe so as long as a manager is on duty