Hi folks. 
I did it for two years and no longer do.
Simply put yes, it will save you very little but some (less than 10% in my experience). Time is a factor when you have a huge flock and mix trash cans full of it with a boat paddle.
I think it's funny that people think their chooks get "more" water. They likely just drink less from the water dish.
Yes, I started even my day old chicks on it. They really never took to it right away and was QUITE the effort me. As stated they don't recognize it as food. Yes, the older birds often require many samples to start appreciating.
My BIGGEST issue is this... feed is ALREADY formulated according to very strict guidelines to meet the needs of our birds. By fermenting, because it "increases protein absorption", that just alters the formulation. It adds some vitamins and such, but it depletes or diminishes others. You don't get something for nothing. Those microbes are consuming sugars or something... in the beginning it smells nice and sweet. Leave it long enough it turns sour smelling the bubbles diminish as the yeast and bacteria run out of feed and start to die off. This is my assessment using reasonable deduction from my experience. I am not a scientist.
Also regarding probiotics.. yes some feeds do have them added already. But also, once your gut flora is in balance... that's about it I think. The body is this amazing thing that DOES have natural balance of good verses bad, assuming their are no current health concerns. Yes, the poo was different in the beginning and that was what made me stick with it for so long. The more people I talked to, and said my birds don't have runny poo... neither did theirs and they weren't fermenting. Since I stopped... poos I pick up on pasture are still plenty firm, in fact the same. There was NO significant difference in the health of my flock. And nothing has changed except the amount of time I spend feeding every day. If probiotics become more important to me then I will use raw acv in my water for a lot less effort. There was NO significant difference in my meat or eggs either.
I personally won't feed scratch and consider the potato chip of the chicken world. No point in doing everything I can to make them healthy and offer treats with minimal nutrients when I have better choices available.
To me you will get your biggest benefit from free ranging (if predators aren't an issue, otherwise saving may be super diminished). After that... I would spend my time sprouting or growing fodder before fermenting again. I might ferment as a treat. But NO, even with 82 birds... the savings wasn't significant enough. Mind you I read I would save 30%... so I got 30% more birds! Then I read I could save another 30% by free ranging so I got yet another 30% more birds. That's how chicken math works right?
Yes I also use flock raiser crumbles which has a lot of fines. I leave the fines once they build up enough without adding new feed that day, and the birds eat it. I have considered fermenting JUST the fines as a treat. Raising feeders to the level of their backs does help avoid waste.
My final suggestion... ferment if you want to, it's fun to try an I'm sure has SOME benefit... I even tried fermenting dog feed (pretty gross don't recommend it), a couple of my dogs did enjoy it. But don't buy all the hype.
Adjust ferment time according to your weather.

I did it for two years and no longer do.
Simply put yes, it will save you very little but some (less than 10% in my experience). Time is a factor when you have a huge flock and mix trash cans full of it with a boat paddle.
I think it's funny that people think their chooks get "more" water. They likely just drink less from the water dish.

Yes, I started even my day old chicks on it. They really never took to it right away and was QUITE the effort me. As stated they don't recognize it as food. Yes, the older birds often require many samples to start appreciating.
My BIGGEST issue is this... feed is ALREADY formulated according to very strict guidelines to meet the needs of our birds. By fermenting, because it "increases protein absorption", that just alters the formulation. It adds some vitamins and such, but it depletes or diminishes others. You don't get something for nothing. Those microbes are consuming sugars or something... in the beginning it smells nice and sweet. Leave it long enough it turns sour smelling the bubbles diminish as the yeast and bacteria run out of feed and start to die off. This is my assessment using reasonable deduction from my experience. I am not a scientist.

Also regarding probiotics.. yes some feeds do have them added already. But also, once your gut flora is in balance... that's about it I think. The body is this amazing thing that DOES have natural balance of good verses bad, assuming their are no current health concerns. Yes, the poo was different in the beginning and that was what made me stick with it for so long. The more people I talked to, and said my birds don't have runny poo... neither did theirs and they weren't fermenting. Since I stopped... poos I pick up on pasture are still plenty firm, in fact the same. There was NO significant difference in the health of my flock. And nothing has changed except the amount of time I spend feeding every day. If probiotics become more important to me then I will use raw acv in my water for a lot less effort. There was NO significant difference in my meat or eggs either.
I personally won't feed scratch and consider the potato chip of the chicken world. No point in doing everything I can to make them healthy and offer treats with minimal nutrients when I have better choices available.
To me you will get your biggest benefit from free ranging (if predators aren't an issue, otherwise saving may be super diminished). After that... I would spend my time sprouting or growing fodder before fermenting again. I might ferment as a treat. But NO, even with 82 birds... the savings wasn't significant enough. Mind you I read I would save 30%... so I got 30% more birds! Then I read I could save another 30% by free ranging so I got yet another 30% more birds. That's how chicken math works right?

My final suggestion... ferment if you want to, it's fun to try an I'm sure has SOME benefit... I even tried fermenting dog feed (pretty gross don't recommend it), a couple of my dogs did enjoy it. But don't buy all the hype.

Adjust ferment time according to your weather.