How long does anaphylaxis take to happen i ate a laptop of salty chips and my lips went white and swollen its been about 1 hr and its got better is anaphylaxis shock instant and if i had it would it of already happened?

If after an hour you're on the internet asking questions you are most likely perfectly fine.

Usually anaphylaxis after a food allergy is quite sudden but delayed ones can occur after a 1/2 hour or so. Swelling of throat and/or wheezing & severe shortness of breath are danger signals and vascular collapse is a dire reaction. You should have taken an antihistamine at least but thus far no signs of critical allergic reaction.