Mishna Yomi: Challa 2: 7 The minimum requirement for challah falls from 1:24 to 1:48 for commercial ventures. The man making a party for his son bakes as much as the town baker for the occasion, but it is private party so the challa is 1:24. The woman who sells the bread she bakes at home may not be making much more than any other private person, but the commercial nature of her baking lowers the cahlla to 1:48.