They don't grow when they're paused.
V5 are paused when left on the travel channel, at the clock-set screen, or when left at the login password screen. Also, if you press the reset button, then select download, the counter for that growth stage may start all over again.
Here are the normal growth times for a V5.
baby + 1 hour = toddler
toddler + 48 hours (2 days) = teen
teen + 48 hours = adult
adult + 48 hours = now can mate (now can use the dating show.) They become parents when they mate.
Note: The above are unpaused times.