I found this from another post in 2008- Anyone have more recent experience to offer?
Little Wenatchee River Trail #1525: Trailhead at 3000 ft, 45 miles roundtrip to the summit via White Pass, with about 11000 ft total gain. Apparently, there are no difficult creek crossings or washed out bridges. Also, a newly built (but unfinished) trail reroute to the north of Meander Meadow saves about 1.5 (?) miles in each direction, so closer to 42 miles roundtrip.
White River Trail #1507: Trailhead at 2300 ft, 51 miles roundtrip to the summit via White Pass, with about 10500 ft total gain. Three difficult creek crossings with washed out bridges in the first 9 miles.
Note that it's much shorter to leave the White River trail after about 9 miles, then bushwhack north up the Lightning Creek drainage to reach the Honeycomb Glacier via a 7100 ft gap, then ascend west to cross onto the Suiattle Glacier at 7800 ft and descend north past Glacier Gap. This route is about 37 miles roundtrip to the summit, with over 11000 ft of gain.
Thanks!