At least seven hours of sunlight...for photosynthesis best results.
The simple answer to questions on light requirements for tomatoes is that you need a minimum of 6 hours to produce fruit, but 8 or more hours of sun will produce the best results in terms of how many tomatoes you get.
The reason that light for a tomato plant is so important is that tomato plants convert sunlight into energy. Tomato plants need energy to make their fruit. Therefore, the more sunshine they get, the more energy they have and the more fruit they can produce.
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No they do not because i had tomatoes at the side of my house that had about 3 - 5 hours of sunlight each day and the grew alot a produced a tremendus amount of tomatoes.