Naps crib/arms

FarmWife 🌾 • 2015 👧🏼 2017 👼🏼👼🏼 2018 👧🏼 🌈 2020 👶🏼
My 8 month can nap in my arms for 2 hours, but if I lay her in her crib drowsy and she falls asleep she can only nap about 30-45 minutes.. Why is this? What can I do differently?