When kids are absent for an illness, they have the same number of days to make up missed work. If your child missed three days, they have three days (from the time they received the make up assignments) to complete the work they missed.

(That's the official policy. So far none of the teachers have been too strict about it but our kids are in elementary school, so it's not too difficult to catch up. I'm not sure what would happen in high school when you have more complex assignments.)