I have this
=IFERROR(SUM(--LEFT(AP32,(FIND("h",AP32,1)-1))*60)+VALUE(MID(AP32,SEARCH("h",AP32)+1,SEARCH("m",AP32)-SEARCH("h",AP32)-1)),"")
which turns 9h0m into countable minutes
bright sparks at work have then adopted 8hr37m as a new way of writing
without mucking up the original...