If the covenants setting up the HOA allow 14 days, then you should have been able to insist that they treat you even-handedly with respect to the time.
As I recall, the HOA I was involved in disallowed any "signs" except those offering a unit for sale.
One unit owner was compelled to remove pro-socialist signage in his windows. His only recourse was to make sure that other unit owners were not permitted to violate the same restriction.
The CC&Rs typically include language which permits the Board to assess fines for violations and that is how compliance is achieved on behalf of all the other unit owners. Things can get pretty rough on a unit owner that violates the CC&Rs.
The difficulty is there is usually enough regulation in place to further nail you for _something_ if you get uppity. The objection letter I got noted two other minor violations - which had been present for quite some time, but nonetheless in violation. I’m sure they were cited ONLY to add “shut up and comply” weight to the other citation, even if it were not exactly “legal” on their part (to wit: “ok, you’re right and can leave that decoration up for another week - in the meantime, we’re filing a lien on your home for the other two just because we’re mad you challenged our authority”).