There is no autonomy option in FreePlay
if they're idle, not tasked, they will go down fast - if you have them hibernating in a bed, their needs will go down slower or you can have them do a move marathon from a tv
You can use muffins, rainbow cakes to keep the happy and green for 24 hrs
A drink at the restaurant rooftop bar and listening to the singing fish will fill all their needs
Otherwise you need to cycle them through their needs.
Social (talk) toilet, wash, eat, rest, be entertained - most can be quick complete for free (be nice to another sim, eat leftovers from a fridge, use toilet, wash hands in a sink, rest on couch, admire picture) Be mindful that not all are free to quickcomplete, teen being nice to teen will cost 1LP, PreTeen eting leftovers will also cost 1LP as examples
Babies can not improve their diaper until it's red, toddlers need and adult to take a bath
If you shake your device they will throw up and their need will go down too when you clean it up.