Paypal may transfer it instantly, but that's only the "beginning" of the transfer. Otherwise, when the transfer says "completed" on the paypal side, it would already be done and your money would be available. As it is, it takes about 2 days for the transfer to say "completed" on paypal's end (depending on the time/day of the transfer), and then another day or so to be "received" and available in a bank account. There's your 3-5 days, which again is more like 3 days.
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