18 full-year courses that are honors seems pretty far-fetched, considering that the average student will have 24 courses total in their 4 years of HS (6 full courses per year). The 18 probably includes Honors classes that are not designated as Honors by UC. That has to be it.
My kid did actually had more than 36 semesters that counted as UC weighted, but it’s only because he had a ton of DE/CC classes. If we use my kid as an example:
10.5 APs = 21
1 Honors class that is recognized by UC (Pre-Calc) = 2
5 DE classes (3 years of Chinese, 2 years of Symphonic Band/Wind Ensemble) = 10
7 CC classes = 7
That’s a total of 40
If you include his “Honors” classes that weren’t designated as Honors by UC, I come up with 11 more. In his case, Alg 2/Trig, World History, English 9, English 10, Biology, and Economics (1/2 year).