How long should it take...

I'm not sure I understand the question. Is it a copyright issue? Are you saying that you personally feel a photo is misleading, and therefore you demand a business should take it down?

Unless it's a copyright issue, or a consumer protection agency tells them to take something down, they can post whatever they want on their website.

dupe

I don't think they have any obligation to take it down, at least legally, since it's not copyrighted or anything.

However, I might write an email being like 'Dear Joe: As you may recall, you agreed to take down the photo of my cornice. However, I went on your website this morning and it's still there. I would appreciate it if you removed it by February 1 (or whatever you want)."

Not much you can do if he won't take it down, though, especially if he took the photo.

If he simply says he does work similar to it, then he's okay. If he actually claims he did the work, then he's guilty of fraud. (Note: I'm not a lawyer. I don't know if there could be any legal means of forcing him to take it down or not.)

That said - how long it takes to change the webpage depends on what process he has to go through to change it. If he created it himself and has handy computer access, it could be down in a minute or two. If he got someone else to do it and doesn't know how to make changes, it could take days. And there's always the possibility he got someone else to do the page and now has no access to it (doesn't know the password, etc.). Then it just might take a long time - if ever.