Tendai Kaihōgyō (回峰行)
Concerning the structure of the thousand day kaihogyo, it is said that the first seven hundred days are centered on self benefitting practice, i.e., practice conducted to gain enlightenment for oneself. But from the seven hundredth day on, it is understood that the practitioners commence upon others-benefitting practice, i.e., practice conducted for the purpose of leading all beings, along with oneself, to enlightenment.
Robert F. RHODES, The Kaihogyo Practice of Mt. Hiei
Essentially 700 days for yourself, 300 to help those behind you on your way. 70% personal practice, 30% sharing the fruits of practice. This is the basis of a wise and stable Bodhisattva.