Actually, BayouBlonde, if you write down the ages of your peeps at a particular time and then check their ages 24 hours later, you'll find they have only aged by 6 years. So, for them to age from 2 years to 19 years takes 68 real time hours.

They do age from birth to 2 in only 4 real time hours but after that it take 4 hours to gain one year in age.