Currently they are only for decoration and will not hatch.
However Mojang have announced they plan to bring more dragons into the game, so you never know, they may be hatchable in the future.
The eggs do not hatch, they are there for no particular purpose but can be collected and brought back to the overworld for use as decoration but will never hatch. To bring it back you need to activate a piston to move it or place a torch under it. It cannot spawn another enderdragon but it can be used as a trophy or decor.
3 stacks
It doesn't hatch, you chuck it on the ground and if luck goes your way, a baby chicken will appear.
Kittens don't grow in minecraft
a few minecraft days
The eggs do not hatch, they are there for no particular purpose but can be collected and brought back to the overworld for use as decoration but will never hatch. To bring it back you need to activate a piston to move it or place a torch under it. It cannot spawn another enderdragon but it can be used as a trophy or decor.
3 stacks
It doesn't hatch, you chuck it on the ground and if luck goes your way, a baby chicken will appear.
It takes 5 hours to hatch.
it will take 999999999999 steps to hatch a egg
10-12 days to hatch
It takes them 5 to 6 days to hatch!!
a few minecraft days
Kittens don't grow in minecraft
Forget about how long they take to hatch. Get to an emergency room and get them removed!
15 days
For Albino Catfish, about 3 to 12 weeks to hatch.