Gulp.
I've just rendered out 9 x 44min files from ProRes to H264 and it took all week!
I guess my mac is a little ancient now as it is nealy 5 years old, but that is a HUGE difference.
Simon
1 week? That's like a holiday!

Unfortunately, Macs don't have anything equivalent in processing H.264. Even CUDA in Adobe 5.5/6 on a Quadro 4000 + 12 core processors can't beat it because it's a dedicated H.264 encoder chip in the Intel built-in GPU. And it's not like Mac Pros will be getting updates anytime soon, IF they are even updated at all.
Intel Quick Sync is the fastest encoder for H.264/mp4. Adobe/Intel have a beta plug-in that quasi works on WIN7, Apple's own Compressor still uses Qmaster with OpenCL and doesn't show a roadmap for using the built-in processor. It's probably because of the code bridge necessary to use a discrete GPU with the Intel GPU, and how a program chooses and/or combine it for encoding.
Of course, encoding and realtime is only part of the equation(albeit a big part). UI intuitiveness, efficiency of being able to do things like layers, efx, text/graphics motion etc are all part of an editing suite.