yung.carl.jung
Hey Bird! I'm Morose & Lugubrious
IMO if something takes that many turns to build (barring wonders) then you probably shouldn't be building it (consider chopping as an alternative) or there has to be something that has gone terribly wrong! 8-10 turns or so for hard-building universities is more realistic... and your capital/well-developed cities should do it in 6 turns (unless you've really been neglecting your mines, or your pop is too low to work many mines!)
But yes, with Mayan cities and their flat farms and lack of mines (due to wasted builder charges), it's understandable. Personally I cringe when I see my Mayan cities take 28 turns for a single university.
Really depends on how strong your cities are, which in turn depends on how many cities and how much military you build. In a game where I only have 10 cities and play peacefully, I might have universities online on T115 and they only take 8 turns to build, as you say. But in the games where I try to play optimally I tend to either settle or conquer at least 20 cities, which means delaying infrastructure (production is one aspect, libraries another) for settlers and military.
That is the reason why many of my satellite cities end up taking 20 turns for a university. it doesn't matter anyway, since as you say, you can chop them out, but also your cities will grow into production, so 20 turns transforms into 12-15 turns from my experience, as cities grow naturally. I tend to agree with you that 30 turns universities are not worth building. I often do not get them and build, for example Shrine into Campus Research Grants instead. Some cities have such low production you don't even want to get anything more hammer-intensive than a library!

But anyway, all of this is just more fuel for my argument, which was that Universities do come rather late (when going for optimal finishing times), and especially when playing as Maya they come late, so the +10% yield boost outscales adjacency also very late.
And while you're talking about early game, don't discount the fact that they're half the cost of a campus, and don't discount that +10% quite as quickly as you did. The observatory will be making science when the Campus is still a construction zone. Say my observatory at that bad +2.2 you mention comes online ten turns faster than your +4 campus. How long until the campus catches up? By that point my observatory will not be +2.2 anymore, but +3.3 (or better if I'm doing my job at cramming districts together in closely placed cities).
Like I said I've only done one game so maybe I either got lucky or am just leaning into the adjacency bonus more than I normally do but it seems pretty fine to me.
When you are playing fast, your Observatories will likely come online at +0, or +1 if you are lucky and got an early Holy Site or double farm or something. As others have pointed out, builders ain't free, Irrigation ain't free, et cetera. Yes, you will be getting your Observatories earlier than Campi, for sure. Because they are built faster. But them being online faster is irrelevant when they give you +0, or +1, compared to +2.
OTOH getting +2 on a Campus very, very early is relatively easy (as you say, +3 or +4 is rare, I concur), while getting +2 on an Observatory very early is literally impossible, because that requires either Irrigation tech, another district tech (and another district!) or 4 farms, all of which you are simply not going to have in the first 20 turns of the game, unless you rush irrigation (meaning no writing).
Everything about Maya is a trade-off, but mountain adjacency is not a trade off, and does not require techs or builders charges.
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