Typical semester degree is 120 credit hours, right? Typical quarter degree is 180. Across 4 years that's 12 quarters is fifteen credits per quarter. 120 credit hours across 4 years is 8 semesters is also fifteen credits per quarter.
26 credits is 16 credits (full load) at one school and 10 credits (2/3rds load) at another school with a 30-minute commute between the two.
it isn't quite two semesters at once but it's close.
30 credits a quarter is two semesters at once. And I've done that. And my wife made a habit of it. And it still took her five years.