Oh, Jet Black, I am so very sorry to read this. Regarding craves, how long do they last? I don't really know the answer to that question and actually don't even think craves had anything to do with my relapse last year. I'm still trying to figure it out; I guess it was complacency? But I'm going to say that, as addicts, we can probably have craves after any length of time. It's just that as time passes, the craves should become fewer and more easily managed.
Where do you go from here? The sooner you quit again, the easier it will be. If you quit now, I doubt that you will have a "hell week" per se but you will likely feel the pull of nicotine that was reintroduced into your system. We're all so different, it's hard to say. Just don't let it go months and months like I did. Then it is basically quitting from scratch again.
Best wishes to you that you fix this mistake as soon as possible!