Sql .. How to calculate DATEDIFF hour with minutes

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SQL-Server

How could return hh:mm

ALTER FUNCTION [dbo].[fn_GetTotal_Hour_and_Munites]
(
    @DateFrom Datetime,
    @DateTo Datetime
)
RETURNS DECIMAL(18,2)
AS
BEGIN
 
DECLARE @TotalWorkDays INT, @TotalTimeDiff DECIMAL(18, 2)
 
SET @TotalWorkDays = DATEDIFF(DAY, @DateFrom, @DateTo)
				    -(DATEDIFF(WEEK, @DateFrom, @DateTo) * 2)
					   -CASE
                                    WHEN DATENAME(WEEKDAY, @DateFrom) = 'Sunday'
                                    THEN 1
                                    ELSE 0
                                END+CASE
                                        WHEN DATENAME(WEEKDAY, @DateTo) = 'Saturday'
                                        THEN 1
                                        ELSE 0
                                    END;
SET @TotalTimeDiff =
(
    SELECT DATEDIFF(SECOND,
                   (
                       SELECT CONVERT(Time, @DateFrom)
                   ),
                   (
                       SELECT CONVERT(Time, @DateTo)
                   )) %3600 /60
);
 
RETURN  (SELECT(@TotalWorkDays *24*60*60) + @TotalTimeDiff)
END

==========================================
this function return only Minutes 00:23
==========================================
but DON'T tell to change to /3600.0
RETURN (SELECT(@TotalWorkDays * 24) + @TotalTimeDiff)

because it return second more then 59 Like 10:86
I just want max second to be 59
like 10:59

What I have tried:

I Tried to change

)) /3600
);

RETURN (SELECT(@TotalWorkDays *24) + @TotalTimeDiff)
================================================
this function return OUTPOT Hours only 10:00
================================================
how could return Hour with Minutes? 10:23 to be MAX Like 10:59 NOT 10:86