Yeah, this is like if you asked your friend how much more productive they think coffee makes them, and they replied with a four hundred thousand degree polynomial over the milliliter. Reality is never that predictable; reasonable people can recognize when they have run out of significant digits. Something has gone severely wrong in your data-modeling, your invocation of the model, or both. If it actually is doing compute for 15s, then to the extent that this works, it is wrapping a vastly simpler function, which I would suggest you graph and use going forward instead. It will save you the runtime, its outputs will be more reliable, and you will get actual insights.