Time Multiplier app

I don't if this has been done or discuss elsewhere if so please point me in the right direction as searching hasn't helped.
I'm after an app that will let me enter the duration of the race and also enter the length of the race in real time so it will give me the right number in the timeMultiplier part of the server.
EG: If for some silly reason I wanted to run 24 hours of Spa in 40 mins the app will give the number so I don't have to think about it.
There are some clever people on these forums who could knock up a calculator very quickly I would think.
Thanks in advance.
 
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