How many days should your child miss school from mono?

Maybe none. It is not necessary to miss any school with mono. It is not very contagious as it is passed by direct contact with bodily secretions. While some children with mono may be too ill to attend school for a time, others may not be that ill. It is best to do what you can do without overdoing it. Overdoing it can make you feel worse, while lying around unnecessarily will make you sick longer.