From 2000s onwards? Well, I had a pretty poor PC so I remember Baldur's Gate 2 and Black & White having like 4min loads. And playing at 15-ish fps. Freezing every now and then.
Odyssey was a strange one because if you were playing it near-constantly then loading almost wasn't a problem (it supported rest mode so getting back into the game at the same point you left off was near-instant), but for anyone doing weekly checks it was a bit of a loading nightmare, as that meant loading into the menu (~1 minute), loading into the game, fast travelling to the store to check the weekly items and grab weekly contracts, then fast travelling to wherever you needed to be to complete the contract. Each of those loads and fast travels would be over a minute (I think it averaged 70 seconds) so getting to the point where you were actually playing the game took maybe 5 minutes.PS4 felt like long loading times especially in games like AC Odyssey and RDR2.
Yes, originally MGS4 needed to install each of its five chapters. That was three or four minutes each chapter, though it felt a bit longer. The reason for that was that Sony were limiting the amount of space that each game could take (which is why so many PS3 games had installs of around 5GB). MGS4 needed more so the workaround was to install ~5GB at a time.Ah right it was one disc but the installation and such were split up for some reason.