True here. When I use the Lacquer primer I usually am top coating with a lacquer top coat then a 2 K Clear. When I use the enamels I use the etching primer if any primer at all. Can't remember the coat window but I again, read the cans of what I am using and follow what they say.Most Duplicolor primers are lacquer, which can be painted over with enamel. BUT! I would give 24 hours after my final primer coat for all of the lacquer solvents (usually a lot of acetone and other aromatic solvents) to go. If you keep them in an area that won't allow smells to get to where you are, your nose should recover enough to tell you if the parts are still putting off vapor. To my nose, most Duplicolor primers and base lacquers smell "fruity" - almost like apples until fully cured. You don't want these trapped under an enamel. A flow of warm (not hot) air can speed removal of the vapor from the surface, but it still needs to work its way out through the film.
I googled the Etch, it is lacquer and Duplicolor says 24-48 for a full cure which you need to coat it in Enamel. If you were going lacquer colour it would be 30 min. the Rule they have is:Paint in haste, repaint at leisure!
i’d give ot 24 hours