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With my personal experience, it should be instant as long as there is no problem with payer's PayPal Account. But if you are referring to Incomplete payments then that depends on a user, you can read more about it here: http://www.jotform.com/help/135-How-to-View-Incomplete-Payments
And please check this PayPal incomplete payments guide: https://www.jotform.com/help/272-Paypal-Incomplete-Payments-FAQ
If you have any further questions please let us know.