Why does exporting HD to a tape take a very long time?

Not a tech problem, really, just a question: just wondering if anyone in here knows why it takes forever to export an HD movie back to HD videotape? I sometimes like to backup my raw footage tapes and have always done so with SD format but HD takes FOREVER, relatively speaking.
On my old SD camera, I could import in real time and watch it on the screen as it imported, and then export back out in real time as well.
Now, obviously HD is a much bigger file format so it's going to naturally take longer and it does, as import usually goes about half speed (I use firewire) but it all gets digitized okay. A full length 60 minute tape takes about 90- 120 minutes to import fully.
The problem is when I want to export that exact same footage back to a duplicate tape. Last night I did one (and it's still going now) that is taking 14 hours to export back to tape. Granted, the duplication is perfect and gets everything on the tape, but it just takes 6 - 7 times longer to do it than it did on import.
So here's my question: why would it import in 2 hours and then export in 14?

Thanks, Andy -- that's exactly what it is. I should have noted in my original post that the videocamera/tape itself wasn't wasn't moving/recording during that long time window, but I was getting a window on the Mac screen that read "exporting to camera" and then below that "Encoding".
I was wondering why encoding was necessary to export and now that I've Googled the term "conform", I see that it's because of the conform process.
Just too bad it takes so darned long.
Thanks for the info.

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