I believe it, having done something similar. I got 2 degrees after spending 2 years at a 4 year college (plus 1 year at community college, I assume this is similar to his AP credit). It's not as hard as you think.
Math and computer science (or math and physics, in my case) have a lot of overlap. Intro courses (Calc 1-4, Physics 1-2, Chem 1-2, English 1-2, etc) are identical. Do a couple of course substitutions (Functional Analysis and Complex Variables == Math Methods for Physics Pt 1&2), and the work might only be 25% more. For me, 1 degree was 120 credits, 2 degrees was 150.
Another trick is to jump right into advanced courses. Quantum mechanics + organic chemistry (8 credits) is a lot of work. Quantum mechanics + organic chemistry + Chem 101 + Intro to Probability (16 credits) not double the work. In QM you derive energy levels for the Bohr atom, in Chem 101 you memorize them. 40 credits probably means 12 credits worth of difficult classes, and a bunch more where he shows up for tests and maybe crams for an hour beforehand.
Math and computer science (or math and physics, in my case) have a lot of overlap. Intro courses (Calc 1-4, Physics 1-2, Chem 1-2, English 1-2, etc) are identical. Do a couple of course substitutions (Functional Analysis and Complex Variables == Math Methods for Physics Pt 1&2), and the work might only be 25% more. For me, 1 degree was 120 credits, 2 degrees was 150.
Another trick is to jump right into advanced courses. Quantum mechanics + organic chemistry (8 credits) is a lot of work. Quantum mechanics + organic chemistry + Chem 101 + Intro to Probability (16 credits) not double the work. In QM you derive energy levels for the Bohr atom, in Chem 101 you memorize them. 40 credits probably means 12 credits worth of difficult classes, and a bunch more where he shows up for tests and maybe crams for an hour beforehand.