Question: how long does it take for a baby wyvern to mature?
Answer: How long does it take to hatch and raise a wyvern to maturity on official servers? on x25 it took between 3.5 and 4 hours. So up to 100 hours on official, and you'll not only need to care every 3 hours, but also give it milk outside of imprint request so that it's health doesn't drop, overwise it slowly dies.