The total time to prepare and cook this dish is approximately 1 hour and 40 minutes to 2 hours, broken down as follows:

1. Boiling and cooling the potatoes: 30-40 minutes
2. Preparing the potato mixture, onion, and tomato mixture: 10-15 minutes
3. Assembling the dish: 5-10 minutes
4. Baking in the oven: 30-40 minutes
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