Good morning,
I work at a job where I get a college tuition benefit. My kid is a rising senior, so you are a year ahead of me. I made an excel spreadsheet listing out the general costs of the cheapest school he was looking at over 4 years. I just put in tuition, fees, books, the cost of the dorm and meal plan. I put in weekly mad money, but not parking, phone, health insurance. It is highly possible it will take him 5 years due to CCOP/engineering degree. But I did not put numbers into year 5.
Do you have similar spreadsheets for each of your kids? It will keep you in the fight. It might even help back you up because the dollars are going to be needed...every darn one!