When Can It Be Waxed?

Not an a body, but I don’t know who else to ask.
I had the left fender, hood, and roof repainted (color and clear) on our ‘07 Accord back in November of 2020.
The guy said don’t wax it for six months because the clear isn’t cured. I waited a while, don’t know if it was six months.
Now, the roof is cracking. The hood and fender are okay.
I’ve never heard of waiting six months, but I haven’t been involved in paint work for 35 years.
Is this true?
He says he’ll fix it, but he’s accusing me of waxing it before the clear was cured.