I been doing body and paint for about 50 years at least. I have never restored a car to lazer straight and would take lots more time to do for sure.
It took me 2 years and working a regular job to restore my Scamp and did a good job on it but not perfect but if I made it perfect than it would be a trailer Queen and I built mine to drive not look at.
I did mud the whole car and engine compartment just to get some of the factory imperfections out because filling primer would have been way to thick.
Cure time on clear coat is about one day max on most clear and if you wait to long then it's hard to buff.
This is just my 2 cents and the way I do it.
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