The Bleed procedure is about half a days job.
Lifter Replacement is probably a days worth.
Cylinder head replacement is a 2 day job.
Its not too bad, but the problem is trying to get that ticking sound to come up at the dealer
That could take some time
The ticking noise mostly comes up in cars that do not get driven long distances everyday. Short commutes does not give the engine enough time to circulate the oil up into the upper chambers of the engine where its needed to lubricate the lifters.