LPT: When reheating a Calzone: Wrap it in foil and bake at 400 degrees for 15-20 Minutes. It will be crispy and warm throughout.LPT: When reheating a Calzone: Wrap it in foil and bake at 400 degrees for 15-20 Minutes. It will be crispy and warm throughout. * /r/LifeProTipsreddit.com