As papasmurf mentioned it all depends on what sort of job you're after.
For our work cars they're usually wrapped and sign written within a day. They'll cut around door handles (leaving the paint colour visible under the handle), cut and overlap sections to avoid tricky folds, tuck edges in around light clusters and so on. In those instances it's a 90% job we are after - most people will just see the cars from a distance and after a few weeks in the hands of an employee they're covered with dirt and crud anyway.
For personal cars they take a lot more time in preparing both the surfaces and the vinyl. They'll remove badges, lights, grilles etc so the vinyl edges are well hidden behind those items once replaced, they wrap behind door handles and cut holes for mirrors so the door panels don't have any visible joins.
The slats on the Gallardo for example were all disassembled from the car and individually wrapped on both sides before being re-assembled. Each one took about 30 minutes for that whole process, and there are 26 slats across the engine cover and rear quarter panels.
The finish on the Gallardo was such that most people assumed it had been painted that colour - there were no obvious joins that suggested it was a vinyl wrap, but obviously if you touched the panels or looked very closely you'd notice it wasn't a painted finish.
