How long is 48 hours in T-mobile time

Curious if 48 hours is actually 48 hours going into the weekend. We set up a split payment and yall took the payment twice. When I called,  the representative said they were made aware that this was a problem and we would be refunded within 48 hours but with that extra payment being taken we are at risk of other things not going through. 

Spent over an hour on the phone trying to get an answer about that and our bad internet 😒. Anyways, has anyone else dealt with this and how long did it actually take to go back into your account?