hey Stan welcome back saw on FB you been on a family road trip ! Hope it was fun.

Have to wait for DB to confirm your question, but I am assuming you are on the money Stan.

DB's rule is 21 days for any finish for the last coat to cure.

with the 12 hours between coats I'd say this is the bare minimum in ideal conditions so personally I would wait at least 3 days between coats - pretty easy when you have 5 or more builds on the go at once!