How many days does jet lag last?

Time Zone traveled. Depending on number of time zone traveled. Traveling from ny to la in usa is 3 time zone and about 3 days it last. Traveling west is less taxing to body then traveling east. Generally jet lag takes one day per time zone traveled. Same time zone travel from north to south has no effect on body like ny to orlando.
1 day / hour change. How long jet lag lasts depends on a variety of factors including how far you've traveled, strategies you're using to help recover, and simply how you, compared to others, respond to time change. A conservative estimate is that it can take one day for every hour of time zone change to fully recover.