I had a hypomanic episode in 2018 - 2019 that lasted for 5 months (The longest and most intense I've had). For someone who went to art school and has never encountered even your basic Quadratic Function before, I was able to:
Learn all basic functions (up to 5th degree), rational functions, exponential functions, logs, log equations, exponential equations, unit circle, trig functions, trig identities, trig equations, basic geometry, limits and some derivatives - and then doing exercises with those.
After 5 months though I was barely functional. I went back to the notebooks I filled with maths while manic and I barely understood anything - it's like some other person wrote those things.
I remember thinkimg super fast when that particular episode happened.

What about you?