Has anyone replaced a brake disc on a magna? And if so how long did it take to take off and put back on?
Trying to save some money doing it myself :/

I would also suggest changing pads as well and Brake fluid. From memory:
1. Undo two bolts (attached to the brake) at the rear of the brake caliper / remove pads
2. Undo two bolts (attached to the hub) at the rear of the hub / remove caliper and DO NOT let it hang, secure it with rope or wire to the strut
3. That should free up the old disc, before you install the new discs give them a proper clean with brake cleaner to remove the protective oil.

Hope that helps I am sure others with more experience will add more comments!