Once roasted, long hots will keep refrigerated in an air-tight container for up to a week. If you submerge them entirely in olive oil and keep covered in the refrigerator they will last for up to a month. You can also freeze roasted long hots in a zip-top bag for up to 4 months. You can reheat in the oven or microwave, but they are fine to eat cold - I prefer them at room temperature.