Problem in entering large time values in Excel 2003

Hello experts

I have this problem in Excel 2003 .
When I enter time values > 24 hrs it is taking only the part of the time excluding 24 hrs.
For ex if I want to enter 25 hrs and 40 mins and if i enter 25:40 cell formatted as [h]:mm it is taking 1:40

but the same thing is working in the computer where there is Excel 2007 version.

any help ?

kmahesh