I did some math on the best boost efficiency for standard permit since I couldn’t find relevant info. Goal was to maximize golden egg efficiency (aka value). If you just look at just the hatchery multipliers, efficiency is as follows. (Value is multiplier x time / cost) 10x for 30 mins, cost 100. Value 3 10x for 240 mins, cost 600. Value 4 100x for 20 mins, cost 750. Value 2.67 100x for 120 mins, cost 4000. Value 3 1000x for 10 mins, cost 15000. Value 0.667 1000x for 60 mins, cost 25000. Value 2.4

But when you factor in boost multipliers, there are 24 possible combos. The most efficient all use 1000x 10 or 60 min boosts. Most efficient combos and their costs: 1 1000x/60min & 6 50x/10min. cost: 205k eggs. value 14.6. 1 10min & 1 50x/10min. Cost: 45k. Value 11.11 1 60min & 6 10x/10min. Cost: 55k. Value 10.9 1 60min& 1 5x/60min. Cost: 32.5k. Value 9.23 1 10min & 1 10x/10min. Cost: 20k. Value 5

The middle two combos where you’re using 6 of of one boost while the longer boost is active are a bit logistically difficult, so you would never be quite that efficient.

Hope this is helpful to a few chicken farmers out there!