As Nike says: Just do it.

You may have to format the result cell as [h]:mm to prevent a "midnight
reset". Unless you have an available numberformat saying 37:30:55. The
basque have, the danes don't. Go figure.

HTH. Best wishes Harald

"Luis" skrev i melding
...
how I do to sum times.
ex.: 10:00 + 15:00 = 25:00 Hs.

Tks.