Tip: Use canned/bottled pineapple juice—fresh pineapple contains bromelain, which can make chicken mushy if marinated too long. Don’t marinate beyond 24 hours. Leftovers: Refrigerate airtight up to 4 days or freeze up to 3 months. Reheat in a 350°F (177°C) oven until warmed through to keep it juicy.