When does your sylestia pet become an adult

27 days for a bred pet, 17 for a generated/starter pet. (I may be off a day for the generated one)

An eggling becomes a hatchling at 72 hours (3 days)
Hatchling to adolescent at 216 hours (9 days)
Adolescent to adults at 648 hours (27 days)


Generated pets start off as adolescents, so they start at 216 hours and require 432 hours (18 days) to become adults. If you use magical pies, that will speed up the aging. (Pies add 144 hours, ie 6 days.)


If you look at the pet's image url, at the end where it says &maturity=___ the number is the accurate age of the pet in hours.