Hi ,
The problem is the extra 0 in the beginning. Because of this , the data is not being recognised as a numeric value.
Instead of entering 010:22 , enter 10:22 , which will be recognised as a number.
But even after this , the values will not be recognised the way you want them to be. If by 10:22 , you mean 10 days and 22 hours i.e. 262 hours , then you need to isolate the portions before and after the ":" , do the arithmetic , and then average the resulting values.
Narayan