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How long after a stay at a Hilton property can you sign up for their program and get the points from the stay?
Unless I’m missing something, it looks like you have to be a member when you stay ([URL]http://hiltonhonors3.hilton.com/en/terms/index.html#accrual_of_points[/URL])
[I]To earn Hilton Honors Points for hotel stays, a Member must be a registered, paying and staying guest at a participating hotel within the Hilton Portfolio and meet all of the conditions described herein. [/I]
If you have an upcoming stay, it’s free to sign up so why not just enroll now to be safe?