It will last at least a week if stored in the fridge. If you've used a sterilized jar to store it in, it will last a lot longer. This recipe is also great for freezing and will last for 6+ months in the freezer. If you want to freeze your lemon curd, allow it to cool completely first. You can freeze it in the jar (make sure to leave an inch or two of space at the top of the jar), storage box, or even in a zip lock freezer bag. When you're ready to eat it, just transfer it from the freezer to the fridge and let it thaw overnight. It's important that you eat it all after defrosting and don't re-freeze it. I'd recommend freezing it in small portions for this reason.