Enough?

I picked a nice batch of tomatoes this morning, about half are Romas and half are Juane Flamme (the golden ones). How do you know how many tomato plants you should plant in the spring? When, at the end of the season, you can say you have just enough! When you have enjoyed enough fresh tomatoes with your daily meals; and when you have enough for salsa, sauces, and stewed, as fresh, frozen and/or canned. Then the trick is to remember how many plants were just enough, the next year. I have a friend that bought a six-pack of tomato plants this spring and saw that there were several seeds that had sprouted in each cell. He separated the seedlings and they all are thriving--all 36 of them! He takes buckets of tomatoes wherever he goes and gives them away! I think he enjoys it, otherwise he would give the extra tomato plants away, instead of the extra tomatoes! His wife says he does this every year. I don't want to take the extra time to care for that many plants (I really don't have enough room for that many, either), or to pick tomatoes from that many plants. Everyone is different, and it is easy to figure out how many tomato plants are just "enough!"