Which of the following is considered on duty time?

The 60 / 70 hour limit is based on how many hours you work over a 7 or 8 day period. Just what kind of work is considered on duty time? It includes all time you are working or are required to be ready to work, for any employer. Here are some specific activities which are considered to be on duty time:
All time spent at a plant, shipping / receiving facility, terminal, or other facility of a motor carrier, unless you are in your sleeper berth or have been relieved of all work related responsibilities.
All time inspecting or servicing your truck, including fueling it and washing it.
All driving time.
All other time in a truck unless you are resting in a sleeper berth.
All time loading, unloading, supervising, or attending your truck; or handling paperwork for shipments.
All time spent providing a breath, saliva, hair, or urine sample for drug / alcohol testing, including travel to and from the collection site.
All time spent doing any other work for a motor carrier, including giving or receiving training and driving a company car.
All time spent doing paid work for anyone who is not a motor carrier, such as a part-time job at a local restaurant.
The bottom line is that on duty time includes all time you are working for a motor carrier, whether paid or not, and all time you are doing paid work for anyone else.