Converting [h]:mm:ss to hours in decimal

Hi guys. I'm having the next problem, I have several values that show me the total time that certain equipment is in use in a week, due to the fact that my data base gives me the total time of all my equipments it gives me a big number.
For example, I usually have this:

A1: 2653:45:00
B2: 2653.75
B2=A1*24

No big deal, this simple formula usually do the work. But my problem is the next one:

A1: 10616:12:00
B2: #¡VALOR! (VALUE for my non spanish speaker fellas)

I would appreciate your help, have a nice day