When my children were in elementary school, we never had a time limit for how long they should stay at the table. If we saw they really wanted to go play with their toys, we let them. It took us 15 minutes to give brohos, sing sholom aleichem and eishes chayil, kiddush, wash, and make hamotzi. By the time we finished the fish, they were already at the table for close to a half hour. Again, there is no one size fits all answer.
In today’s generation with the limited attention span of most individuals, presetting a time for how long a seuda should take is almost pointless. In my parents house the shabbos seuda usually was completed within 45 minutes.
I am not sure about 5-7 course meals. We genrally have only a 4 course meal: fish, soup, main, dessert.
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