Three times.
One heavily space themed hypercoaster which had a height marker 61 to 1 drop, bunny hops underground after the first drop which went up to marker 5, and then a normal type hypertwister (big hills, lots of turnarounds.) The Because a lot of speed was worn off in the bunny hops at the begining, I had to install boosters at the top of the 1st hill so it would be fast enough to get up the second major hill, so it went almost 105 MPH.
Another one was a hyper-terrain-twister. The first half was a standard Magnum-esque hyper, complete with the turnaround pretzel. The next part was a terrain coaster wrapping around hills, and going through a few tunnels, ending with a huge final helix (1620 degrees) and a single bunny hop. All of the terrain part was in a forest.
The 3rd one I built was on a workbench, just a huge, (not very tall, around 40) twisting helix nightmare. It was over 20,000 feet long.
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Hey, SFGAm managment, can I buy a couple cages of Sky Whirl?