How long does it take to buy Bitcoin with Mercado Pago on OKX P2P Trading? The time it takes to buy Bitcoin with Mercado Pago on OKX P2P Trading will depend on a few factors, including the availability of sellers willing to accept Mercado Pago as a payment method and the speed of the payment processing through Mercado Pago. However, the process should generally be relatively quick, with Bitcoin being released to your OKX P2P Trading account as soon as the payment is confirmed.