10x10x9 = 900 ans.
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The answer depends on how many digits are used to display the time: 4 (hh:mm) or 6 (hh:mm:ss)?
There are more 12-digit palindromic numbers than 11-digit palindromic numbers. This is because the number of possible 12-digit palindromic numbers is greater than the number of possible 11-digit palindromic numbers. In general, the number of palindromic numbers of length n is 9 * 10^((n-1)/2), so for 11-digit palindromic numbers, there are 9 * 10^5 = 900,000 possibilities, while for 12-digit palindromic numbers, there are 9 * 10^6 = 9,000,000 possibilities.
900000
763920
Assuming you mean digits and not didgets, the answer is 6.