OK - I am trying to track data that keeps track of how long an event took.
For example - a typical data point would be customer hold times on the
phone.  I would like to track that the Highest Hold time of the day was in
this format:

00:01:26

Which should represent that the hold time was 1 minute and 26 seconds.

No matter how I have tried to format this data, Excel is trying to interpret
this as the time of the day, not a length of time.  So for Excel, it think
what I have entered is 12:01:26 AM.  When in actuality - this could have
occurred at 9:00 AM or some other time of day.

I can get it to display without the AM/PM but Excel still interprets this as
actual time and not length of time.

That would be fine except I wish to then be able to graph this time over a
few quarters. and Excel is not doing what I want then.

Is there some way to force Excel to understand that this entry is not the
actual time but a length of time?

Thanks,