I am an undergraduate student (moving to last year this September). I found out that on my third year, I needed much more time to work on assignments and exam questions compared to 2nd year. I think I am kind of slow and a little bit worried in the last year that things might get out of control. So my question is how long does it take for you guys to solve a question like this for example ? (Griffiths, Introduction to Electrodynamics 4th ed, page 147, example 3.9) A specified charge density $$\sigma_o(\theta) $$ is glued over the surface of a spherical shell of radius R. Find the resulting potential inside and outside the sphere. It took me 27 minutes to complete the rough work (without looking at solutions& no interruption )and i need 4-5 minutes to present it "nicely" on a new piece of paper.. some assignment questions will take me hours or days. In short, how long does it take for you guys to solve a question of average difficulty (your own standard)? any advice?