Where do you want to dump the edited video when it is complete? Online video? DVD production?
If it's for online, Experiment with the h.264 codec for online publication.
Dump it to compressor, Make a 1 pass mpeg file then bang it onto a DVD.
Yes it won't be a "HD Video" and you'll obviously lose some content to title safe but a straight forward DVD will guarantee he can watch it on anything...even his DVD player! ( Just be sure to test it yourself before you send it to him )
I'd expect an hour long video on a older machine to be left for a period of hours in order to render, especially if it is scaling the video down rather than a straight encode.