I did about 23 miles in 12 hours in late June from Tahoe Meadow to the Christopher Loop spur and had a great time.
Great views of the lake all around, many many snow-drifts and I was unable to fully crest the Christopher Loop for the reported great photo ops due to heavy snow on the switchback trail up.
Most of this section of the TRT is open to mountain bikers on even days.. I had no issues, just something to be aware of. Great fun!