I have a colum where the amount of time required to make a particular part is
listed in seconds (this is the result of a formula subratcting the start time
from the end time). I have a pivot table to add the total amount of each
type of part time and the total time required to make the parts. I can not
get the seconds and minutes to add up to realistic numbers.

How can I add minutes and seconds and get a usable number?