pump timing (minutes on/minutes off)

[Beverly]

Hi Ron,
I'm sure that the answer to this question is located somewhere in your website, but I couldn't find it today, so thought I would just ask you this way. What rate of adjustment in pump timing (minutes on/minutes off) should be made for vegetables (tomatoes) as the plants mature? I am still at 30 minutes on and off and it seems like I need to add more "on time", because plants are limp but not wilted by the time the pump turns on again. What is the minimum off time for mature plants with tomatoes?
I plan to send some pictures as soon as I get gardens number 3 and 4 up and running. Thanks for the excellent start you gave me.
Beverly in Kissimmee badepew@juno.com