It is said that a Bodhisattva practice asceticism, while being reincarnated over and over, for Sangi hyakudaiko (countless time (kalpa)): a long period of time, since he experiences a religious awakening until he becomes a Buddha.
これには、菩薩が発心してから成仏するまで三祇百大劫という遥かに長い年月の間に転生を繰り返して修行するとされる。