said by Bob4:If you submit the form, it may take up to two billing cycles (according to the recording on the phone).
It's only "up to" 2 because if you request the credit (or, if it is applied) just before the billing cycle ends when the bill is generated, it will not show until the one after that. Same thing goes with requesting it over the phone, just that you know it is entered at the time of call (not a guarantee with the online form).