The short answer is no.
The long answer would be, by noting down every single spell you cast along with a list of variables such as weather, physical and mental status- perhaps even astrological patterns and moonsigns.
You then note down each time you have yielded an effect pertinent to your spell and the duration it took. Over time you will be able to see if the spells are effective, reliable and predictable in a time frame- or if it is more likely to be coincidence.
When people ask this question my usual response is, "Who cares? You got what you wanted!".