Maybe 15 minutes, easy hiking except for the very end. Try hard to stay on the trail system or you can get lost. After you drive down the dirt road you will come to a spot where the road cuts left back towards the river, but dead ahead is the end of an old logging road. Park here, or just past this is a pull-in spot on the right that fits maybe one car. Basically you get on the logging road and follow it west (upriver) for a couple minute until a trail splits off to the right. Follow the trail for a few more minutes, I think there is one more intersection where you bear right again. Eventually the trail goes uphill and follows a drainge gully until you cut right and arrive at the base to the left of the start of Endeavour. You can either rap (probably two ropes, use trees) or hike off, but the hike off and back to your car will take some time, its 2-3 miles I think. Have fun, its a nice route.
(edited to remove scree field comment, can't remember if that's actually where you want to be. just stay on the trail!)