What others said, but I’d add that it doesn’t really save that much time (10-15 minutes?) going up the fire road. And the red isn’t really long enough on it’s own to make a worthwhile ride. Even at a bumbling fat-bike pace I can do blue and red and get a grossly overpriced cup of tea at the cafe before a 2 hour ticket runs out.
If you just want maximum fun, minimum effort (or rather, most hills least filler) start the blue, then skip the stickler and ride straight to lower star post, then skip the out and back to seagull and head straight for red 15. From then on the red and blue is far more jumpy/bermy BMX track style stuff.
Nothing wrong with the rest of the stickler and the rest of the red, but if I had <1hour and wanted to do the best bits, those are the bits I’d skip.