Trying to finish up the macro with this message box

wtime=ActiveCell.Value
MsgBox("You worked for " & wtime & "Hrs:Min")

Cell where the value is taken from contains formula, is formatted as [hh]:mm
and is displayed right. But when I try to use the value in the message box, I
get something like 9.12435E-3.

It's gotta be simple but I can't figure it out.
Thank you