This is such an underrated gem mod if you want added challenge to your playthrough.

I used to wait until autopsies were free because it seemed the economic thing to do, right? Now I do most of them when I can and their time to do is short enough, waiting means you don't get those enormous advantages earlier (mind shield, battlefield medicine, etc.) Waiting until they are free is its own punishment.
BTW I have done autopsies ITRW and a well-performed procedure can be done in a couple of hours. Let alone how Tygan does them which is pure butchery. It was even worst in X-Com 1, I think it is meant as a funny thing, or as a nod to the famous/infamous alien autopsy of Roswell, which true or false was also a butchery.
Just sayin'...

We need either one mod pack or two mods that are instantaneous autopsies, research, debris clearing, and facility production

I SUPPORT THIS MOD

Just uploaded an Update for compatibility with future upcoming Mini-Mods... ;)

Just uploaded an Update for compatibility with War of the Chosen... ;)

Nice idea but I also think that scaling down the research time to 1 day with more corpses is better idea. But hey, as a LW2 player I can get so little corpses with no/little risk and without the help of other mods (which I use) I think I could insta-research only 2 or 3 times so "meh". But good idea nontheless.

mmmh.... doesn't convince me... in my mind all those corpses are stored in a massive freezer (probably near the ship's kitchens?... ;) near the frozen pizzas?) and Tygan's team doesn't have a single free minute to defrost even one of them and have a look at it (because they're always super busy concentrating on the currently assigned research).

I only have time to mod stuff that I personally need/want to use in my own Campaign. But if enough people "votes" to add this option (x% Autopsy time reduced for each collected Corpse), I might push it up into my daily priorities list. :)

Surprisingly this is one aspect of the game I didn't have issues with (and this is me agreeing with other more-realitistic entries your series). like d_valroth mentioned a portion of it is that there's a stockpile of corpses and the team gains familiarity with it over time. What I would counter suggest (if possible) is that each additional corpse brought in lowers the autopsy time SLIGHTLY (like .1 day or something). It'd convey the idea thematically a bit more cleanly than "welp, we have enough. INSTANT."
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also, there's a gameplay balance. Delaying the autopsies until it's free can delay development in key areas. For example: Viper's Medkit bonus. And with some entries simply NOT being worth researching other than to make way for the subsequent dependencies (i.e. sectoid's mindshields) it's a sorta quality of life boon to the player.
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my two cents at any rate

I think the idea was that with enough battlefield experience and a mountain of corpses building up in the Avenger (where do they keep them?) Tygan's assistants can just brute force autopsy them in a day. If you only have one, Tygan takes his time figuring it out. The actual autopsy should be a matter of hours at most, the full research time is likely involved in tissue analysys and lab reports, which presumably the assistants can do when they have dozens of bodies to pick apart. Also it's kinda silly anyway that you have to autopsy a Stun Lancer...to figure out how his sword works. :)