Cell C4 and E4 are set to "1:30 PM" The cell is formatted to "Number 2". If I add &" Hr(s)" it truncates it back to 1 decimal place if the result number end in 0.
Excel Formula:
=IF(AND(C4="",E4=""),"",IF(AND(C4<>"",E4=""),HOUR(NOW()-C4)&"."&MINUTE(NOW()-C4),IF(C4>E4,24-((24*C4)-(24*E4)),((24*C4)-(24*E4))*-1))&" Hr(s)")