It's important to note that their size can vary depending on factors like:
* Genetics: Some snails are simply genetically predisposed to be larger than others.
* Diet: A snail with a plentiful and nutritious diet will grow larger than one with a limited food supply.
* Water conditions: Optimal water conditions (temperature, pH, etc.) can contribute to healthy growth.
So, while 1-2 inches is a general guide, some individuals may be slightly smaller or larger.