John's timeline is meaningless for Porsche. It is his experience that worked in his case. Your results will be different.

The successful Buffalo Protocol does not start exercising until all concussion symptoms have abated. Then, the workouts are to a prescribed effort / pulse level. The patient/client works out until a head ache or other symptoms manifests. The threshold pulse rate is recorded. Then, the next exercise period, the pulse limit is set at 80 % or so of the symptoms threshold.

Keep in mind that an exercise facility may also create a risk of a head impact.

Exercising while you are nauseous will slow your recovery. Weights at max means your are causing muscle breakdown and repair. This floods your blood stream with the byproducts of muscle breakdown. No good for your brain.

Listen to your doctors.