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Yes. This requires a custom number format in the cells containing the times that you wish to add together.
Now when you add the times from cells with this format together, you will get the true sum of hours and minutes. Otherwise, the sum will reset to zero each time 24 hours is reached. This new format will be located under the Time Category, at the bottom of the list of Formats, until you add more custom formats that fall into this category.
Documentation / User FAQ / Calc / Previous-Next