Best set up to level heros the fastest.
I posted something a while ago. Here is a picture of my training camp setup. Two at TC 11, one at TC 20, and one at TC 4 but you only need that one at TC 2. Keep at least one going in TC 20 to try for 5* hero. I have two in the TC 11 camps producing extra low cost heros every two hours. The last camp I cycle between using swords and the swap to backpacks. In one day running this set up I produce 80 heros in one day.
You just need to auto farm 8-7 constantly. After you expend you flags produce feeders with your swords first and then your backpacks. Feeding color specific heros from the barracks is a waste of resources
You can ignore the TC 20 info. It is not helpfully for leveling the hero. You can actually run three camps at extra low cost and one between backbacks and swords.
This will all depends on what level your training camps are at, but any of the trainers that do color specific are a waste of resources, took me a long time to figure that out.
I use all 4 for those Low cost to get about 70/day
You want to run the extra low cost at TC 11 because build time is only 2 hours compared to three for the regular low cost, and it is less recruits and food
That last picture was from when I saved all produced heros up. At 19 hours in I was at 73, I got up to almost 90 at 24 hour mark
I use the extra low cost also
Using that set up and diligently farming 8-7 on auto everyday all day until flags were gone I got Alasie from 1/1 to 4/80 in 14 days
A freinds told me another method she says takes about 10 days. I will post later, but you need TC 19.
So FYI… you can fully level a 5* hero in 10 days but farming 6-8 for max recruits (you get 8-10 recruits each time) and then running them all through TC19 for the extra fast training.