With standard mail, you should allow 5-10 days for U.S. postal service. With the proper account information, your account is updated on the day your payment is received at Sprint. Including your remittance slip along with your payment helps ensure your account is updated in the fastest manner possible.
When submitting a payment online, the payment will be processed within two business days. Please note that your online bill is a representation of your account as of the last statement date. You will not see your online payments reflected until your next statement is issued.