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In general, tomatoes take around 60 to 90 days to grow and then ripen. In a hydroponic system, because you are providing the plant with the absolute best growing conditions, I would expect this to be sooner, and you should be enjoying your tomatoes within 60 days at the very most.omatoes are fairly hardy plants, meaning they can thrive in a wide range of temperatures. Generally, a temperature of 18Â°C to 25Â°C is desirable during the day, and a temperature of between 12Â°C and 18Â°C at night time.
Starting tomatoes from seed allows you to grow the variety and quantity you desire. It also means you need to calculate the proper time for starting the plants. To do that, you need to know how long it will take your plants to reach the desired size, and the last expected frost date in your area.eedlings. To get seedlings ready for planting in the garden when all danger of frost has passed in your area, you must count backwards six to eight weeks from the last frost date. Planting the seeds at the proper time is an important part of growing tomato plants from seed.