At http://en.wikipedia.org/wiki/Planck_time, we find the following:

for which we read at this URL that:

"Theoretically, this is the smallest time measurement that will ever be possible,^{[3]} 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."

Conversely, at http://en.wikipedia.org/wiki/Planck_angular_frequency, we find the following:

Thus, if the Planck time is the smallest possible unit of time that can exist, then the Planck angular frequency must be the maximum possible frequency that can exist.