30 Elite Night Credits with Marriott Credit Cards
You earn Marriott elite status by staying at their hotels for a certain number of nights per year. Elite night credits through credit cards make that easier. Each calendar year you can receive credit for 15 nights towards the next level of Marriott Bonvoy Elite status. However, until now Marriott had a limit of 15 elite night credits per Marriott Bonvoy member. That seems to have changed today with many people seeing 15 elite night credits in their accounts. That is 15 from a personal credit card and 15 more from a business card.
This is apparently a new policy and not just a glitch. Here are the terms that you can find on your Marriott credit cards: