Number in time format

[capriconuser]

I have this formula 

=Num(Sum({<TaYear=,TaMonth={'$(vMaxMonth)'},TaQuarter=,TaQuarter=,TaMonth=>}
Hours),'0.00')

output of this formula is 162.16 

now I want to convert this format in time format like this 162:16

when I use interval and timestamp this shows me different output .... 

[tresesco]

If you are only bothered about replacing '.' with ':' , the you can try like:

Replace(<YourExp> , '.',' :')

However, I am not sure if the expected output would be very meaningful in all the cases, especially because summing number and representing the same with timestamp like presentation would probably not fit always.