The watering is also going to depend on the mix and climate in addition to plant habit. I grew F1 Sweet Million and Sungold last year in 10,15,20 fabrics with PromixHP and water soluble ferts. These hybrids were not pruned and were vigorous plants with abundant fruit and the 10's could not make it on one watering on the hottest days. This year I have 4 Sungold, two are in 15 gal fabrics and two are in white 10gal plastic grow bags which run slightly hotter on soil temps, but lose less to evaporation.
A healthy large cherry tomato plant can be grown to excellent production in a 15gal fabric, this I know as fact. I don't think I'd go smaller than a 10gal without automated fertigation.
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