大方廣圓覺修多羅了義經略疏 2.1176

2.1176

「即建道場。當立期限，若立長期百二十日，中期百日，下期八十日。」

"they should establish a bodhimanda. They should set a time limit: if setting an extended period, one hundred and twenty days; an intermediate period, one hundred days; a shorter period, eighty days."