Here's my try at the longest drift, I got 1:25.06 so far. I think I should be able to to 5 to 7 mins without the timer. I also recorded the video, I'll upload it later.
Here's a pic.
Edit: Here's the video.
YouTube - Grid Freestyle Drift
I need more practice! I want to do a whole 10 minutes, lol. Very nice though!