When stored at room temperature, meringues can stay fresh for about 2 weeks. Thus there is no need to refrigerate meringues at all. In leaving meringue at room temperature, it is very important that the dessert is stored in an airtight container.Bacteria grow rapidly at temperatures between 40 °F and 140 °F; lemon meringue pie should be discarded if left out for more than 2 hours at room temperature. ... Freshly baked lemon meringue pie will keep for about 2 to 3 days in the fridge; refrigerate covered loosely with aluminum foil or plastic wrap.Make it and bake it: Bake the meringues as soon as you're finished whipping the egg whites. ... Make ahead: The meringue layer can be made several days ahead and kept tightly wrapped in plastic or in an airtight container until you're ready to assemble the pavlova. However, meringue does not keep well in humid weather.When all the syrup has been mixed, continue to whisk the meringue until it has cooled. It should be shiny and stiff. Allow to cool completely before using. ... Italian meringue can be stored in the fridge for up to two days.