The tortillas can be stacked in an airtight container with pieces of parchment paper between each for up to 5 days. You can also freeze them for up to 3 months. Reheat the tortillas in the microwave for 10 seconds for refrigerated tortillas or 20 seconds for frozen ones. You can also place them individually in a nonstick skillet set over medium heat until hot, 20 to 30 seconds a side for refrigerated tortillas and 30 to 40 seconds for frozen ones.