After running an FMRI experiment we're looking at the logfile in DirectRT. It shows that our first event started @ 621556.

We're 99% sure that the computer didn't take 10 minutes to show the first stimulus (since the whole run was only 4 minutes).

How is this start time calculated? (e.g. from the time the file is run? or is there another marker that is used as the starting time?)