In patches they expanded Nettie’s and Halsin’s dialogue to make it more clear Tav wasn’t going to change right away.
In patch 8, Halsin told my party to slow down and enjoy life after we freed him. I don't know if it was because it only took two or three days or if it's because Tav hadn't bothered consulting Nettie or talking to Kahga. It felt like the developpers were talking to me directly, because Halsin doesn't have an in-game reason to say that...
For myself in video games I am used to urgent main quests that aren’t urgent to do first, so I never thought Tav would turn into a mindflayer if not cured within a couple hours.
Disco Elysium handled that quite well. Exasperated NPCs will ask you to please, for once, stay focused on the main mission. This lets the player know the main mission is important, but gives them an in-world reason to put it off : you're not exactly an exemplary cop.
