Yes the mirrors are limited to a certain speed interms of wont fold when doing over 10-15mph iirc.
Also you'll see it takes longer to fold on one side because the angles are different on left & right, if you goto front of the car & look at the mirrors you'll see audi's wisdom of setting them at non equal angles, which to me was stupid & I'll quantify this comment shortly, they did this to give us better angles for when moving the seat & mirror glass.
But I've fitted a lhd & rhd mirror on either side that gave me equal angles without realising it lol & have to say, sod knows why they needed unequal angles, as you have plenty of view at any mirror glass position, but alas audi knows best, huh huurrrmmmm.
There is an issue with some mirrors where one mirror can actually fold slower regardless of angle, another known fault is where one mirror doesnt fold fully in & leaves it loose/floppy & another where one folds & other doesnt, these are all faults & either new door modules or new folding mechanics are needed.