No need to design a school for most students. Many people regularly pull 18 credit hours with a job. If they don’t need to work a meaningless job then bumping that to 20 seems extremely reasonable.

Really, an elite admittance process coupled with a school that focuses on getting people out quickly vs ramping up course difficult seems like a viable tradeoff. The biggest issue with early graduation is often a few rare required classes. Design the schedule to avid that issue and you have a huge advantage.