Timing Total Build Time

I need to keep track of the total time spent during a day building the
program we are working right now.  This will be used as justification
for faster hardware/more memory.  Is there an automatic way of keeping
track of this time?  I basically just need a total for build times
during the day without having to remember to record build times.

Thanks.

Sent via Deja.com http://www.deja.com/
Before you buy.