If you don't encounter any traffic, the Pavement to the Springs Campground can be done in a little over 2 hours aired down without using a locker and without using 4WD. TURBO and I did this for MCR9 in the dark in 2WD and it took us two in a half hours. There were just three spots coming down Cadillac hill where you'll have to use your brakes to keep the front end from freewheeling.
BigMike
Since you can not get up to the trail until friday evening I would suggest the tahoe side. It can take a while to get to the springs from loon especially if there is traffic. If you can spare the time I highly suggest that you head out toward loon lake on sunday just so you can see the whole trail.
Sounds like what we'll do then. Thanks for the advice guys. I would like to see the whole trails so we'll try to head out toward loon lake on sunday. I'll try to meet up with you John at the springs maybe Saturday some time. And BigMike, if you guys need any help with the event saturday let me know.