Rear shock was replaced last summer. It was already discussed here.
Run time is unknown yet. Will update as soon as I have more data. Need to fix few more things.
quality of these bikes is horrible so many things got replaced so far. 2 sets of lead batteries, motor, both sprockets, rear shock, 2 of original throttles, ignition switch failed and was bypassed.
need to do: throttle one more time, front fork, all brake calipers, will get hydraulic brakes.