Hello Jogec,
You can use the following formula:
=IF(ISNUMBER(SEARCH("h", A2)), LEFT(A2, SEARCH("h", A2) - 1) * 60, 0) +
IF(ISNUMBER(SEARCH("m", A2)), MID(A2, IF(ISNUMBER(SEARCH("h", A2)), SEARCH("h", A2) + 1, 1), SEARCH("m", A2) - IF(ISNUMBER(SEARCH("h", A2)), SEARCH("h", A2) + 1, 1)), 0) +...