If I remember correctly (and probably don't) it takes about 10 day's from approval to receive the card... current postal delays may extend that arrival time.
Generally with most companies about a full week to 10 days. Not sure on Credit One. I've had some cards that arrived within days via FedEx and some that I almost forgot I applied for by the time they arrive.
The current postal situation I would add another day or so to whatever estimate they gave you. Most things are slower going through the mail these days, expect for my utility and cable bills somehow they seem to be arriving in record time.
