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Same thing you are doing as adding 1h55m + 1h55m = 310
for i=1 to numberofoverflow=1
add 40 t0 310
result will be : 3h 50m
Example2 : 1h50m + 1h50m +1h50m = 450
for i=1 to numberofoverflow=2
add 40 to 450
result = 5h 30m
Now adding 40 in this case or substracting 60 where you have take minute parametere only .
No difference....
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