You won't believe what I'm building. 
It's a giant R2-D2 sculpture built out of canned food.
It's for a charity event called CANstruction. http://www.sfcanstruction.org
R2 will be 7' tall with a 3' dia. body.
All this coding is to get his head to turn.
I know R2's head should turn 360 deg. but my pot. only turns 270 deg. & I don't want to deal with winding/unwinding the wires.
Unfortunately my current motor is under sized & can't turn the head with much load on it, so I can't answer your questions about have long it's taking to turn it.
I have 2 larger motors on order now. Maybe you'll be right & I can put it back to only have the maxSpeed at the midPoint...