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No Buddha, however, dies till the sāsana is firmly established (D.iii.122).  There are three parinibbānā in the case of a Buddha: kilesa parinibbāna, khandha parinibbāna and dhātu parinibbāna. The first takes place under the Bodhi tree, the second at the moment of the Buddha's death, the third long after (DA.iii.899f.; for the history of Gotama's relics see Gotama). Some Buddhas live longer than others; those that are dighāyuka have only sammukhasāvakā (disciples who hear the Doctrine from the Buddha himself), and at their death their relics are not scattered, only a single thūpa being erected over them (SNA. 194, 195). Short lived Buddhas hold the uposatha once a fortnight; others (e.g. Kassapa Buddha) may have it once in six months; yet others (e.g. Vipassī) only once in six years (ThagA.i.62).