If it's PayPal funds being sent to another PayPal account it would be instant, barring any random funding holds which could happen based on a variety of variables. If you're using bank funds and you have a credit card attached to the PayPal account, then it may be able to do an "instant transfer". This would give the receiver the money right away, and if the bank transfer fails it would use the card to cover it. If that's not available, then it would do an e-check, which typically takes 3-5 days to clear.
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