I feel like such a newbie asking this but i can never remember or find out the aging times.

So can someone tell me the hours/days it takes for each age change. I know eggling to hatchling is 72h/3 days but what are the others?

Im pretty sure adolescents turn to adults once theyre to 27 days old, so 26 days is their last before they automatically move to your stables

Eggling stage lasts 3 days/ 72 hours
Hatchling lasts 6d / 144 h (starts: 72h)
Adolescent lasts 18d / 432 h (starts: 216h)
Adulthood starts at 27d / 648 h

But then again adding on what scath wrote theres a little thing called nurturing that boosts stats and decreases aging rate so your pets might get older faster
And as an adolescent hey can have a magical pie
So honostly it could take even less time then expected

thank you all, that was really helpful!