it will take hundreds of hours to dial in an OEM level experience. In my experience it took just a few hours to be safe and effective at WOT and so so driving around the street. The thing about having so much control is you have so much control. Imagine instead of having the half a dozen pump cams for a Holley you instead had an injection mold machine to make whatever shape of cam you wanted.
That's been my experience anyway, having only ever done 1 and still learning after 9 years running it.