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10 Digits (0 to 9)
In the base-10 system, the 4-digit whole numbers are every number from 1,000 to 9,999. That's 9,000 numbers. If decimals are included, there are a lot more. For example, from .0001 to .9999 alone, there are over 9,000 more.
The place value of each digit is b times the place value of the digit to its right where b is the base for the system: whether that is binary, octal, decimal, duodecimal, hexadecimal, sexagesimal or some other value.
One fewer than the base for the number system.
If you mean a number system analogous (similar) to our decimal system, the base for such a number system can be any integer, 2 or greater. In other words, the base can be 2, 3, 4, 5, etc. You need as many different digits as the size of the base (decimal is in base 10, so you need 10 different digits).