Theoretically, this is the smallest time measurement that will ever be possible, roughly 10^−43 seconds. Within the framework of the laws of physics as we understand them today, for times less than one Planck time apart, we can neither measure nor detect any change.
The Planck time is a theoretical lower-bound on the length of time that could exist between two connected events, but it is not a quantization of time itself since there is no requirement that the time between two events be separated by a discrete number of Planck times.
The Wikipedia article on Planck time says:
However, the article on Chronon says:
So, if I understand this rightly-
Any two events must take place at least one Plank time apart. But so long as they do, it can be any number of plank times—even, say, pi. Right?