Special & General Relativity Questions and Answers
What kind of experiment would show that time is quantized?
The only context in which physicists speculate about the 'quantization' of time is at scales of the Planck distance or 10^-33 centimeters and 10^-43 seconds. There are no large-scale theoretical indications that time is anything more than what we observe it to be as a continuous progression of 'instants'. I have never heard of any proposal to test whether time is quantized at any scale.
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All answers are provided by Dr. Sten Odenwald (Raytheon STX) for the NASA Astronomy Cafe, part of the NASA Education and Public Outreach program.