Yes. What is time, really? How can we define it except by the processes which it, itself, gives meaning to? We talk about things that occur at a certain rate per second, but how quickly does time pass? It's estimated that my universe began some ten or fifteen billion years ago. On the other hand, the smallest amount of time with some physical meaning is likely to be about ten to the negative forty-four seconds.

The universe, as we observe it directly, consists of three length dimensions and one time dimension, and to find out the smallest or largest unit of space-time, one must multiply all four together.