This is a return to running protocol. 2x workouts at the same run/walk duration are needed to feel good before moving on to the next set. This will gradually build you to running 10 minutes at a time by the end of 6 weeks and running 60+ minutes. Gradual return to run following an injury along with building strength in your lower leg will significantly reduce your risk of injury.
I am a triathlete and Physio specializing in athletes returning from injury to accomplish their goals and empower athlete to achieve that they didn't think was possible.