If it is really the sum of some durations you can get the amount of hours by multiplying the cell by 24. The internal representation of a date or time cell is the number of days since beginning of the year 1900, so you have to multiply it by 24 to get the number of hours. (The year 1900 is not interesting for you as you just want a time span.) The Hour
function does not work here because you get the day hour which is 5 in this case.
Be sure to format your target cell as regular number.
与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…