How long to share a simple 1080 project to Master File on 2013 iMacs or Mac minis?

A friend has just bought a new basic 21.5" iMac.
He has made a simple 1920x1080 (AVCHD) project lasting just under an hour.
It took him 15 minutes to share it to an H.264 Master File.
Put another way, the sharing process was about a quarter the length of the video.
A similar project on my 2008 iMac would take me around 3 hours to share, so it appears that his iMac is around 10 times faster than mine.
Is 15 minutes for an hour long video normal for a bottom of the range iMac?
What time does your computer take to share an hour of video to H.264?
You could just test it with a 1 minute clip to get a rough idea.
Needless to say I'm sick as a parrot!

If I knew a new iMac could export 10x faster I would be very happy but I have a feeling that if I bought one it wouldn't be anywhere near as fast.
As you say, it's probably the GPU that does it but my friend's iMac probably will have one of the integrated graphic cards. (I haven't seen it as he lives over 300 miles away!)
Given a "general" test with Geekbench his iMac is only about 3 times faster than mine but obviously the graphics card gives it much more speed when exporting video.

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