Welcome to the forum.
Much will depend on the original source footage, the speed of one's computer and also the Export/Share settings.
It is almost impossible to judge whether your times are logical, until we know all details of the those factors.
This is aimed at Premiere Pro, but may help
A link with many ideas about computer setup http://forums.adobe.com/thread/436215?tstart=0
Work through all of the steps (ideas) listed at http://ppro.wikia.com/wiki/Troubleshooting
If your problem isn't fixed after you follow all of the steps, report back with ALL OF THE DETAILS asked for in the FINALLY
section, the questions at the end of the troubleshooting link... most especially the codec used... see Question 1