How long does it take for the promotional credit to be applied to my Kogan.com account once I’ve met the criteria? How long does it take for the promotional credit to be applied to my Kogan.com account once I’ve met the criteria? B How long does it take for the promotional credit to be applied to my Kogan.com account once I’ve met the criteria? The promotion credit will be applied to your Kogan.com account within 10 weeks after the end of the qualifying period and will expire 12 months from the date it is applied.