Which animal has the longest gestation period for a reptile?

The Leatherback sea turtle has the longest gestation period for a reptile. The Leatherback sea turtle is one of the largest living reptiles, and can weigh up to 2,000 pounds. Females reach sexual maturity at around 16 years old, and their nesting season typically lasts from March to July. During this time, females make their way to sandy beaches to lay their eggs. The gestation period for a Leatherback sea turtle is around 60-70 days. During this time, the eggs are buried in the sand and left to incubate. When the baby turtles hatch, they make their way to the ocean and begin their journey.