This fully depends on the payment methods used with the order.
Payments are processed automatically and the time needed for you to receive necessary access details to your service may vary, depending on the payment method used to place the order. Credit card and PayPal payment methods are usually completed almost instantly, whereas payments placed with CoinPayments require 2 confirmations in order for the purchase to complete.
Note: CoinPayments transactions usually take no longer than 15 minutes, occasionally take up to a few, and in extreme cases, even a few days. Should you not receive any email after the before-mentioned time-frame, then you may submit a ticket and provide relevant payment information.