Formula for determining number of hours?

Does anyone have a formula which would determine number of hours like for
9:00-12:30, or 1:30-3:00 etc. so that I could use result and multiply it
times number of days and have total hours? Guess it would involve conversion
to 24 hr clock?

If A1 has 9:30 and A2 has 12:15 then =A2-A1 yields a result of 2:45 (2 house
and 45 mins)
I can multiply this by 2
The formula =(a2-a1)*24 yields 2.75 (2 and 3/4 hours)
The formula (A2-A1)+1*(A1>A2) can be used to allow for passing thru midnight
Or use ((A2-A1)+1*(A1>A2))*24
best wishes
--
Bernard V Liengme
www.stfx.ca/people/bliengme
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"Susan" <dsnsacree@msn.com> wrote in message
news:ONPEswGnGHA.2128@TK2MSFTNGP02.phx.gbl...
> Does anyone have a formula which would determine number of hours like for
> 9:00-12:30, or 1:30-3:00 etc. so that I could use result and multiply it
> times number of days and have total hours? Guess it would involve
> conversion to 24 hr clock?
>