How to format time in decimal format & calculate time

[Cheyenne]

I used the CUSTOM function as [mm:ss], but it's not working as I thought that
it would. What I want is a user to type in the number of dictated minutes
they typed for a job; i.e: 2:30 (2 min. 30 sec) and have it stay in that
format as decimal after entered. However, I'm getting results of 12:00 for
that example when using the format stated above? I also want to add these
dictated minutes and have the result calculated in H:MM:SS. HELP? I've tried
everything!

[Post for Microsoft: I couldn't execute this NEW post in the EXCEL
discussion group as it kept giving me a posting error and I tried several
times]

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[Sheeloo]

If you want to enter in decimal then get your users to enter 2.5 for 2
minutes and 30 seconds.

You can add them up and divide the result by 24*60 and format the cell as
[hh]:mm:ss tp get the total time in hours/minutes and seconds.