I can do 20 to 25 km without problems, so it should be ok.
One more question, though. I did try once to reach the trailhead from Wulai, but I was stopped some few km after the police station by another (mildly drunk) policeman who apparently spends his days in a tiny hut just after this bridgehttp://maps.google.com/maps?q=%E5%B0%8F ... 2,315,,0,0
Is this a new addition? Do you guys know whether an extra permit is needed? ~~~