How long does it take for mystery snails to grow big

[teenage fish]

Hi, so I am wondering the grow time for mystery snails. I have two big ones, but I received them when they were already big. Is it the feeding regimen? Or is it something else?

[KBOzzie59]

Food / Calcium / Time

[Marnol D]

So i have had multiple clutches hatch in multiple tanks. I say the biggest variable to growth is food quality and quantity. Just like with other animals the snails that eat more and are more gluttonous will grow bigger and faster. I feed boiled pumpkin hunks mine and the usually sit on it till its gone. No make sure you have a good supply of calcium in the water column and in their food sources. I use calcium tablets that sink to the bottom and the snails eat them. 

The more gluttonous snails can grow 4x as fast as their siblings who dont eat as much. I had a hatch recently and some made it to a dime size in a month while others were almost golfball size (i think these sat on the food chunks constantly and ate)

[TheSwissAquarist]

If you wish to make them grow faster, I would suggest adding Wonder Shells or some other calcium rich substance