Harry Potter Magic Bus Puzzle

If you're a wizard with an urgent need to travel safely and discreetly, you just have to stick out your arm by the roadside and the Knight Bus will appear. Once aboard, this purple three-decker bus will slip through small passages and travel much faster than a regular bus so you can reach your destination on time. Now, one question remains to be solved: how long will it take you to assemble this 3D puzzle of 280 pieces from Harry Potter™?