You don't have to wait at all, but the paint should be completely dry. You don't want fibers getting stuck in the paint, particularly if it is a contrasting color. I would also be concerned about possible damage to the paint surface. The back of a new carpet is some nasty rough stuff that will strip off paint and skin faster than a grinder!
3 hours man
You should typically wait at least 6 months before painting treated wood to allow it to fully dry and settle.
You should wait at least 6 months before painting treated wood to allow it to fully dry and cure.
You should wait at least 6 months before painting pressure treated wood to allow it to fully dry and cure.
You should typically wait at least 6 months before painting treated wood to allow it to fully dry and cure.
You should wait at least 6 months before painting pressure treated wood to allow it to fully dry and cure.
You should wait at least 6 months before painting pressure treated wood to allow it to fully dry and cure.
Maybe a day or two
you don't just click on the painting and you go to jail
because it will smear and the painting will be messed up.
wait, or add a drying agent
You should wait at least 6 months before painting treated lumber to allow it to fully dry and settle.