How long should i stay at home with my children?

okay so here is my situation ... i have one daughter 18 months old, and we are trying to conceive again (we really want 3 children). anyways - i am a stay at home mother and i love every second of it. however my husband and i aren't seeing eye to eye about how long i should stay at home with the child(ren). He wants me to go back to work when the child(ren) are in school, but i want to be the homeroom mom, girl scout leader, and all around soccer mom. also- keep in mind that its not money thats an issue (although extra money is always nice)- just a matter of what would i do with my time while the child(ren) are in school. what would be a good comprimise?