After 30 days, most charge card companies give you a warning. We give you another 30 days. We understand that sometimes a three-day business trip turns into three weeks, and by necessity, you could use some extra time to pay your bill. That’s why we always give you the convenience of an extra billing period to pay when you need it, interest-free. Call us at 1-800-2-DINERS. We’ll answer all of your questions, no extra charge. Diners Club. Breaking the plastic mold.