Leviticus 23:18 (KJV)
18 And ye shall offer with the bread seven lambs without blemish of the first year, and one young bullock, and two rams: they shall be for a burnt offering unto the LORD, with their meat offering, and their drink offerings, even an offering made by fire, of sweet savour unto the LORD.
According to the above text all sons of Israel were supposed to bring a sacrifice of seven lambs,one bullock & two rams for burnt offering during the festival of weeks which lasted one day.
It is interesting that when king David took a census(1 Chronicles 21:5) there about one million one hundred thousand men,so if all men were to bring their sacrifices this will translate to around eleven million animals.
How were they able to sacrifice all these animals on an altar measuring 2.3m*2.3m*1.4m(Exodus 7;1)in one day?