When does self check out close

It's 24hr

Never

It depends on the day between 9-10 PM

Never. In fact you can't get a human later at night except to watch you while you check out

It doesn't.

I don't know yet butt ill do d out ok?

When the store closes.

Around 9pm-10pm at 24*7 stores, else when the store closes

I think its when the store closes.