Wow, the time part of this was the biggest hurdle... I did not include importing, assigning track folders/busses (i.e. housekeeping), or the initial listen to the 30 minutes; but then I started the clock.
 
Knowing the time constraint, I focused mostly on faders, EQ, compression, and reverb. Busses were assigned to Drums, Backing Vocals, and Guitars. Much more fader work than effects, EQ on Lead Vox, Kick, Snare, HH (rest on busses). Time ran out, so much of this is "right down the middle" as far as stereo spread, with only minimal spread to drums, and wide spread on the Backing Vox. I initially set the resonance of the kick way too high, so lost the pan time correcting that flub.
 
To maximize time efficiently, I worked on Lead Vox->Drums->Guitars for effect, and copied FX to get closer to the mark. When listening I looped several sections to balance out the mix (a lot of looping/soloing done in 30 minutes).
 
Anyway, 30 minutes as quick as I could work: http://www.ariphys.com/Documents/Challenge.mp3
 
Edit: Time was the biggest factor here by far, so the "heavy hitters" in the mix got the most focus (FX work), while other elements were worked at a buss-level, and some only with faders (such as the Rhodes and cowbell). I took time to tailor the kick, snare and HH (taming that rim shot, but oddly not taming the high end which came through more than I wanted on the export). Big things I learned here:

1. My screen was not set up properly (only one screen initially), and the console became a menace to navigate. Screensets would have also helped this, although I should have had the console on the second monitor before I started.
2. Even though I did housekeeping, I never colored the tracks/busses, so that made #1 even worse.
3. Unfamiliarity with Sonitis FX. Not used these in years, and found the controls being sensitive a hurdle at first. Also due to time, I compensated by only using the top level controls of each effect.
4. It became obvious early on that to make 30 minutes and achieve something that "polishing" was unlikely. Although I would have liked to do a lot more, I was forced to focus on the main elements first.
5. I should have panned at the time of EQ (which would have saved time), but missed this for the most part due to the kick drum flub.*
6. No automation was used, but that was a nicety I would like to have included.
7. The console view got more use in this exercise than I typically do! Finding FX quickly while using the track view for navigation helped a lot. However, I can see the hurdle of this with more than three FX in that bin, so support the feature request of that automatically expanding to size (I think the feature request was specifically for sends though).
8. My navigation could have been much faster if I was more familiar with keyboard shortcuts. I found incentive to learn them better with this exercise.
9. Vagrant thoughts of inserting sends got squashed early into this exercise as the time limit became apparent right away.

 
 *The system I mix with does not have a sub-woofer, but the 5.1 system connected to my RealTek HD does. I did not notice the kick was packing a wild punch until after the first export.