The Troop Leveling at the Barracks is VERY expensive on food if you have the troop feeders for more lucrative 3* and preferably 4* troops. It’s a good waster, if you have the feeders, and a very necessary part of the game in order to advance far in the Seasons.
That’s a good point. I edited my post to include that. Minor antidotes are very useful in negating Burn Damage from Fire titans, Poison Damage from Dark Titans, Defense Down from Ice Titans, Attack Down from Nature Titans, and Blinding Effect from Holy Titans.
Like using 1* heroes to level 5* heroes, troops are only expensive because 75% of loot troop drops are 1* troops.
Rumors from Beta say Hero Academy creates 1* to 4* troops. So troop training might become cheaper. Or not. SGG makes a lot of money from energy refill micro transactions.
Resource surplus
To answer you original question, it has been over 157+ days since I collected from training camps or farms.
I think @zephyr1 has finished their base ( until Stronghold 24 is released). So iron piling up.
Some times spending food (farms ), iron ( mines ), or finished recruit training ( camps ) is not an option or not the best option.
You have max food and not enough recruit. These are what I do until now.
Run 3 TC20 and 1 TC 11. TC 11 is good to keep recruits … usually I farm recruit during atlantis season 2. 6. 9. I got at least 20 recruit just using 3 discount ticket. I keep these extra recruit on TC 11. My TC 11 have more than 360 days to finish training my extra recruit. When I have extra food, i take 100 recruits from TC 11 and I add training in TC 20 …
But when I need extra food I will take food from TC 20 and all the extra recruits will be keep in TC 11 …