How to you make data validation go through? - c++

Question

When testing my output, there's one part (the red circled part) that I'm having trouble with.
When the input starts with numbers and then letters, it goes through (ex. 45Gge). After, the program ends, skipping the part where it asks if they want to do it again.
When the input starts with letters and/or numbers, the validation fails loop works (ex. gsdf or ggs52). Does anyone know why it allows for numbers then letters to go through?
#include <iostream>
#include <iomanip>
#include <limits>
int main()
{
float fee = 0.0;
float hours = 0.0;
float minFee = 2.50;
char choice;
std::cout << std::setprecision(2) << std::fixed;
do
{
std::cout << "Enter parking hours: ";
std::cin >> hours;
while(std::cin.fail())
{
std::cout << "\nIncorrect Input! Numbers Only.\nTry Again.";
std::cin.clear();
std::cin.ignore(std::numeric_limits<std::streamsize>::max(),'\n');
std::cout << "\n\nEnter parking hours: ";
std::cin >> hours;
}
if(hours <= 3)
{
fee = minFee;
}
else if(hours > 3 && hours < 24)
{
fee = (((hours - 3) * 1) + minFee);
}
else
{
fee = 20.00;
}
std::cout << "\nTotal Cost: $" << fee;
std::cout << "\n\nWould you like to pay another fee? (Y or N): ";
std::cin >> choice;
while(choice != 'y' && choice != 'n')
{
std::cout << "\nIncorrect Input! \"Y\" or \"N\" Only.\nTry Again.";
std::cin.clear();
std::cin.ignore(std::numeric_limits<std::streamsize>::max(),'\n');
std::cout << "\n\nWould you like to pay another fee? (Y or N): ";
std::cin >> choice;
}
}while(choice == 'y');
std::cout << "\nThankyou for your payment." << std::endl;
return 0;
}
I want the circled part to validate the data.