well its usually 72 hrs or 3 days after becoming an adult....for example :
tama was adult at 5 yrs old and at 8 the match maker came....then 2 or 3 days later the parent of you new baby will leave at 12 midnight and then you can continue on your 2 generation
hope i wasnt cofusing and if you knew bout some of the things its alright
i just wanted to make sure i mentioned almost everything