Depending on what veggies you used, your tofu scramble will taste freshest for 2-4 days. If you use bell peppers and mushrooms, they tend to get a little slimy after more than 3 days. But if you'd like to meal prep / batch your tofu scramble for the work week, try using heartier veggies like carrots, potatoes, broccoli, cauliflower, peas, etc.