To change the rear head oil return O-ring on a Ducati engine, first remove motorcycle.
To be fair, this was the first time I've worked on one and it only took me about an hour and a half, including making the cradle to support the engine.
Often the longer way to do a job is actually quicker. I used to drop the right rear suspension off my X1/9 to change the cambelt, but could do so in about half an hour, the Fiat service book time was over three!