seven days

Leviticus 14:8
The one being cleansed must wash his clothes, shave off all his hair, and bathe with water, that he may be clean. Afterward, he may enter the camp, but he must remain outside his tent for seven days.

Exodus 29:30, 35
The son who succeeds him as priest and enters the Tent of Meeting to minister in the Holy Place must wear them for seven days. . . .

Numbers 19:12
He must purify himself with the water on the third day and the seventh day; then he will be clean. But if he does not purify himself on the third and seventh days, he will not be clean.

Ezekiel 43:25-27
For seven days you are to provide a male goat daily for a sin offering; you are also to provide a young bull and a ram from the flock, both unblemished. . . .