I know that it is critical that we must find the balance between performance and quality while modeling, which is called optimization. I was not happy with the quality when I used the spin steps in lecture, so I used different number for my model. The number is 34.
Naturally, you will ask how did I find this number 
well, this may sound a bit odd while explaining. Because of that we spin for 360 degrees, I used multiples of this number:
360/2 = 180 (too many)
180/2 = 90 (still seems too many)
90/2 = 45 (still too many)
45/2 = (22.5) 23 (looks not smooth enough to me, so I made one extra operation)
45*3/4 = (33.75) 34 (seems acceptable for me)
What is your way to calculate the number of faces to reach optimum result? Or do you use some general rule to limit number of faces while modeling?
Thanks
