Multiple transits

Are you eligible for the 24 Hour TWOV on the outward flight, then the 144-Hour Visa Free transit on the return 10 days later?

We are looking to do:
London - Shanghai - Osaka with only a few hours connection in Shanghai on the outward flight
Seoul - Shanghai - London for the return flight with a 4 day stay in Shanghai.

The return flight would be 10 days after the outward flight.

We would expect to be eligible for the 24-hour TWOV on the outward flight and the 144-hour visa free transit on the return flight.

Are we correct or are there restrictions on the number of visa free transits we would be eligible for?