Hey awardtrail readers, listen up! National Car Rental has a bit of a quirky system when it comes to expiration dates, and you definitely don't want to get caught off guard. The good news is that your rental credits themselves (think of them as points you earn towards free days) don't actually expire. That's a relief! However, here's the catch: those glorious Free Days you redeem those credits for *do* have a firm expiration date. So, you could find yourself in a situation where you have plenty of credits, but your earned free days poof out of existence if you don't use them in time! Why does this matter? Well, nobody wants to lose out on free travel! This means you need to be a bit more strategic with your National rentals. Don't just rack up credits and forget about them. Keep an eye on when those Free Days are set to expire and plan accordingly. Basically, book that road trip *before* you lose your reward!