Click Here
Hope the link works.
It is impossible to tell you how long it will last without knowing flow rates and watering schedule. Try the link, it should give you some insight.
The Click Rate = the number of hours you can water on one gallon of fertilizer.
1.4gal/1000sq.ft Maximum (1.4gal x 9000sq.ft.)/1000=12.6gal
Do Not exceed 12.6gal/year of fertilizer (cool season grasses)
Click Rate x 12.6gal= Total number of hrs fertilizing per year(Maximum)
This post has been edited 1 times, last edit by "Central Irrigation" (Mar 5th 2013, 6:15pm)