New grower wondering about extended nutrient schedules

I'm currently in the process of setting up my 1st grow ever besides the time i tried in my moms house when i was 15. I have 5 greenhouses set up to hold 12 ft plants, my main concern is that its going to be longer than 12 weeks to do this. Im using fox farms nutrients and their schedule says to just repeat week 12 until the end but if i start growing in febuary and i end up growing till september using week 12 over and over seems very repetitive for that long of a time. Is that information accurate? And advice would be helpful. Sorry for sentence structure writing is not my strongest quality.

PH meter + dry nutrients (cheaper/more concentrated) Maxigro/Maxibloom.

I'm assuming if they repeat there is a note somewhere to flush at some point in that repeat. Without a PPM meter you feed on that schedule to keep the PPM of your nutes approximately correct. If you use a PPM meter you can monitor your nutrient levels and only add when needed and skip extra flushing. You don't need the dry nutes, just saying it's an easy option that costs less for a top quality nutrient per dose.

The schedules are used for different stages of growth. They start at a light feeding for young plants and work up to mature plants. If you are going to keep your plants in veg for an extended period of time you just keep using the same formula. Then adjust for the flower cycle.