you don't have anything to be sorry about, some of us talk ducks on this thread. I am going to give you this link and hopefully it will help. I have had ducks sitting on eggs for quite a few years noiw and I don't even mess with the eggs, At the begining I will count to make sure others hatven't been laying in her nest that way she won't have eggs that won't hatch till way after hers do. but other than that I just leave her alone and let her take care of it all. I know it's worrisome but it's better not to intervene if you don't need to.Oops! I forgot to include this! Sorry, sorry. lol
https://www.backyardchickens.com/t/343252/how-long-do-ducks-take