It usually takes me 2.5 hours from top to bottom but I am pretty slow. Some can do it in an hour.
Since the Gabrielino takes you back to JPL you can go at whatever pace you want but no one gets left behind.
If you have never ridden "Red Box" then look it up. It is not for beginners. If you have ridden before have good control and common sense = know when to hike your bike - this trail is for you.
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Nice pic from Pinos Chris. I know every inch of that trail. Thats the 'watch your head in the tree' jump.