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It is not an exclusive property of millis(). Any counter with a limited number of digits eventually returns to zero. For example, a 4 digit tally counter returns to zero after 9999.

Under the hood, the variable for millis() is of type unsigned long, which is 32 bits on the Arduino. In this case, the 32 bits (binary 0's and 1's) are similar to the digits (0 thru 9) on the tally counter.

The maximum is 11111111 11111111 11111111 11111111. Once there, millis() returns to zero when you add 1. The maximum (32 "ones") is 2^32 - 1, which equals 4294967295 in the decimal number system. The maximum value for the counter is, therefore, 4,294,967,295 milliseconds. Converted to days you get approximately 49.71 days.

It is not an exclusive property of millis(). Any counter with a limited number of digits eventually returns to zero. For example, a 4 digit tally counter returns to zeros after 9999.

Under the hood, the variable for millis() is of type unsigned long, which is 32 bits on the Arduino. In this case, the 32 bits (binary 0's and 1's) are similar to the digits (0 thru 9) on the tally counter.

The maximum is 11111111 11111111 11111111 11111111. Once there, millis() returns to zero when you add 1. The maximum (32 "ones") is 2^32 - 1, which equals 4294967295 in the decimal number system. The maximum value for the counter is, therefore, 4,294,967,295 milliseconds. Converted to days you get approximately 49.71 days.

It is not a property of millis(). Every counter with limited number of digits once returns to zeros. For example a 4 digits tally counter returns to zeros after 9999.

Under the hood the variable for millis() is of type unsigned long which is 32 bits on the Arduino. Here the 32 bits are the digits of the tally counter. With only two digits of binary 0 and 1. The maximum is 11111111 11111111 11111111 11111111. After then it returns to zeros if adding 1. The 32 ones is 2^32 - 1, or 4294967295 in decimal. The maximum value for the counter is then 4294967295 milliseconds. Converted to days you get approximately 49.71 days.

It is not an exclusive property of millis(). Any counter with a limited number of digits eventually returns to zero. For example, a 4 digit tally counter returns to zero after 9999.

Under the hood, the variable for millis() is of type unsigned long, which is 32 bits on the Arduino. In this case, the 32 bits (binary 0's and 1's) are similar to the digits (0 thru 9) on the tally counter. 

The maximum is 11111111 11111111 11111111 11111111. Once there, millis() returns to zero when you add 1. The maximum (32 "ones") is 2^32 - 1, which equals 4294967295 in the decimal number system. The maximum value for the counter is, therefore, 4,294,967,295 milliseconds. Converted to days you get approximately 49.71 days.

It is not a property of millis(). Every counter with limited number of digits once returns to zeros. For example a 4 digits tally counter returns to zeros after 9999.

Under the hood the variable for millis() is of type unsigned long which is 32 bits on the Arduino. Here the 32 bits are the digits of the tally counter. With only two digits of binary 0 and 1. The maximum is 11111111 11111111 11111111 11111111. After then it returns to zeros if adding 1. The 32 ones is 2^32 - 1, or 4294967295 in decimal. The maximum value for the counter is then 4294967295 milliseconds. Converted to days you get approximately 49.71 days.

It is not a property of millis(). Every counter with limited number of digits once returns to zeros. For example a 4 digits tally counter returns to zeros after 9999.

Under the hood the variable for millis() is of type unsigned long which is 32 bits on the Arduino. Here the 32 bits are the digits of the tally counter. With only two digits of binary 0 and 1. The maximum is 11111111 11111111 11111111 11111111. After then it returns to zeros if adding 1. The 32 ones is 2^32 - 1, or 4294967295 in decimal. The maximum value for the counter is then 4294967295 milliseconds. Converted to days you get approximately 49.71 days.