Four things....
First, entropy, like time, is not an ontologically existent thing. It is an idea. There isn't any sort of physical stuff out there that is entropy. It's just a concept.
Second, as Right Divider pointed out, time isn't measured that way. Indeed, if anything, it is entropy that is measured in terms of time, not the other way around.
Third, even if time were somehow measured that way, it would just be happenstance. In other words, whatever it was about entropy that you found to use as a clock, it would still just be a series of regularly occurring events that were being used, not entropy itself, per se.
Fourth, we are given information in the bible of at least one major way in which time will be measured in heaven....
Revelation 22:2 In the middle of its street, and on either side of the river, was the tree of life, which bore twelve fruits, each tree yielding its fruit every month. The leaves of the tree were for the healing of the nations.