yearly
Judges 5:11
They that are delivered from the noise of archers in the places of drawing water, there shall they rehearse the righteous acts of the LORD, even the righteous acts toward the inhabitants of his villages in Israel: then shall the people of the LORD go down to the gates.
four days
1 Kings 9:25
And three times in a year did Solomon offer burnt offerings and peace offerings upon the altar which he built unto the LORD, and he burnt incense upon the altar that was before the LORD. So he finished the house.