Should exporting to quicktime take this long??

using Handbrake, i have converted from VIDEO_TS to .mp4 encoded with H264 (at 640x476 with an avg. bitrate of 1500 k/s).
i wanted to combine two titles in the VIDEO_TS folder into one .mp4. so handbrake converted the two into .mp4 files which i then imported into iMovie on a new Mac Pro.
in iMovie i created a new project with the two files, selected both, and exported using quicktime. i exported under similar settings to the original files, resolution (640x480), same bitrate (1500 k/s), H264, etc.
the length of the exported movie is approx. 30 minutes.
2 of 8 cores are running the export. (it's still in process) but the initial estimate of time was roughly 600-700 minutes. it dropped down a little bit initially, but is certanly well over 500 minutes.
now running all 8 cores, the conversion from VIDEO_TS to .mp4 via Handbrake took about 7-8 minutes at the similar settings as indicated above.
should iMovie really take over 500 minutes? do i have a setting that is suboptimal? should iMovie be able to take advantage of more cores like Handbrake?
thanks

2 of 8 cores are running the export. (it's still in process) but the initial estimate of time was roughly 600-700 minutes. it dropped down a little bit initially, but is certanly well over 500 minutes.
This does sound a bit long. (Would normally expect expect about 75 minutes on my older machine using a default preset.) On the other hand, if all you want to do is merge the two separate files together as a single file, why not use QT Pro ($30) if you already have it or MPEG Streamclip (free) to save the files in a single container and skip re-compression process altogether?

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