Invoice Rounding?

Invoice Rounding?

Hi,

I have rounding disabled in my preferences but when creating an invoice from a timesheet all time for a task is rounded to the nearest hour. For example, 1 hour 30 minutes is rounded to 2 hours while 1 hour 25 minutes is rounded to 1 hours. How do I disable this so that the exact time on the timesheet is used in the invoice?

Thanks.