Hi! What is the longest you can keep the starter …

Name: Gluten-Free Sourdough Starter
Prep time: PT-483926H56M
Total time: PT-483926H56M
Cuisine: Allergen-Friendly
Ingredients: 8 cups gluten-free brown rice flour*Filtered or spring water**1 tablespoon maple syrup (optional)1 tablespoon grape juice, freshly squeezed from organic grapes (optional); Tools; 1 large glass jar (at least 950 ml)1 large elastic band1 coffee filter***; * Organic brown rice flour might work best. Freshly milled grains work equally well.** Chlorinated tap water will not work.*** You can also use a doubled-lined cheesecloth or breathable clean cotton fabric.