mxracer652 said:From what I understand it gets "used up" and will stop on its own, it's the Beano that doesn't stop due to having something else besides alpha amylase in it. Help me if I'm wrong here, I read this junk on the internet...
Nope. The nice thing about enzymes is that they are merely catalysts and don't get "used up".
The reason that you need to make sure you have sufficient enzymes in the mash is that the higher temperatures (which are used to accelerate the reactions) also start denaturing the enzymes, and the mashout/boil almost immediately finishes the job.
At normal temperatures though, there is really nothing stopping them from chewing through all the more complex sugars/dextrins.