Excel Date Function Error

I'm trying to display the total number of hours worked. The values are coming from Access. When I preform the query in Access, it displays around 1.3 hours, which relates into 1 day and 7 hours. I want Access to display 31:00.

The query returns the value of 1.3 into a date variable named sup_hours

using the immediates window I did

? sup_hours
12/31/1899 7:00:00 AM

if I try to do

? format(sup_hours, "[h]:mm")
:12

I don't know what :12 means at all, all time values are in full hours, so there should be no minutes at all. Hopefully someone is able to help me, I've been all around the internet looking for a solution to this problem.