Vicki, that mixture will result in something around 100-125 ppm N, so is fine for use at every watering. Doing so less frequently is no problem. I subscribe to the "weakly, always" mode of feeding, so made the concentration recommendation on the label accordingly.
Now let me ask you something: as you got that from me, why didn't you just email me with your question?
(Sarah - Vicki has the liquid version. It is made by dissolving powder in hot water, so has been diluted from the original label strength.)