Some sects follow the practice that define the chuin period as the period of 35 days after the death because when the chuin period of 49 days is over three months, it reminds about the phrase 'shiju ku ga mitsuki' (literally, "forty-nine days over three months," always suffer hardship), a pun based on the pronunciation of Japanese.
他宗では、中陰（ちゅういん）が三ヶ月に跨る場合は、「四十九（日）が三月＝始終苦が身に付く」との意味から、三十五日までとする風習に従う場合もある。