...Even with 10 breeding facilities it will take 40x6h=10 days non stop productions to research just the first. We have 18 researches, some with 10x that amount. And the amounts of ascended mercs needed to build and upgrade the race buildings are insane. This race will never end by the look of it.
The bright side is that breeding facilities produce x2, x3 then x4 times more creatures than level 1 as we upgrade them to level 2, 3 and 4.
It's indeed very expensive in T8 ascended goods, but definitely worth it to speed up production.
Also researches asking for creatures of the night "feel" easier to fulfill as we produce them at a higher rate than the creatures of the light.
A significant downside however is that pretty soon we have to produce a 3rd type of creatures, the ultimate ones, using the upgraded portal (3 production slots at level 2, 5 at level 3). And it takes a insane amount of creatures to produce these new ones. Here an example with the portal at level 3, it takes 1000 creatures of the night (or 666 creatures of the light) to produce 107 ultimate creatures in 3 hours (with +42% from BTG)
When you see that 9 researches in the tree ask for these ultimate creatures, between 1k and 6k each time, for a total of 27k to deliver, that's significant additional creatures production needed to move forward.
The reduction of breeding facilities in the quests (10 then 8 then 6 requested) seems to imply that we reduce the number of facilities over time to compensate for their progressive size increase (from 4x4 level 1 to 6x6 level 4). Well I'm definitely keeping my 10. Even considering adding more.