This is an "It depends" answer. Your soil type, water pressure, and types of plants will all affect the watering results. Water pressure can vary greatly, as can the length of tubing - each of which will affect how fast water will come out of the tubing. Typically the water will come out at about 0.46 gph for this drip tape. You could run the water and test at 15 minutes, 30 minutes, 45 minutes, etc. to confirm results for your set-up.