I Need Some Help With Time Exceeded

Question

Okay so basically I have this one c++ problem and it is driving me
CRAZY. Could I please have some help :3

int lengthOfArray(int num){
int sum = 0;
for(int i = num; num > 1; num / 10){
sum++;
}
return sum;
}

^^ The above code returns Time Limit Exceeded, but I why?
Some help ples

Answer 1

Thank You!! Cheers mate