I have found that much better root growth happens under few than 5 seconds. And as roots grow so does the plant.
Basically, the ideal is to maintain your pod so as it never gets too wet, or too dry. In that scenario 5 seconds is too long, as is 30 seconds, let alone 5 minutes if the lights are on.
Based on input from a mentor, I actually need to increase my 17G pod to 30 gallons to better accommodate a one second spray from my Aquatec 8800 pump feeding a single high pressure low flow mist head. I am still playing with pause times, currently 20 seconds during lights on; manually switching to 40 seconds for lights off.
Consider that a 5 second timer will cost $70 discounted, a Sentinel DRT-1 is around $100. The ~ $30 difference will pay for itself in the first 2+ plant grow.
hth