Excel doesn't recognize those strings as numbers.
A B 1 1:17:41:24 2 0:01:39:00 3 1:19:20:24A3: =TEXT(SUMPRODUCT(--LEFT(A1:A2, FIND(":", A1:A2) - 1)) + SUMPRODUCT(--MID(A1:A2, FIND(":", A1:A2) + 1, 8)), "d:hh:mm:ss")
That will only work to a total of 31 days.
Bookmarks