Counting to the Graham’s number is not a feasible task. In fact, Graham’s number is so large that it exceeds the number of particles in the observable universe, making it practically impossible to count to it.
To give you an idea of the scale of Graham’s number, it is estimated to be around 10^(10^10^10^3), which means that it has more than 70 million digits. Even if you could count one digit per second, it would take you billions of years to count to Graham’s number.
It is not possible to determine the exact time it would take to count to Graham’s number as it is simply too large to comprehend or even conceptualize.