Problem in basic C [closed]

I am learning to program in C and they left us a job to do, but when I want to compile I get an error and as far as I know, I still do not know what the error is. Thanks in advance and sorry if it's a very stupid question, I'm still learning.  error: expected ')' before ':' token |

#include <iostream>

using namespace std;

int main()
{
    int codigo, costo, valor;
    float minutos;
    cout<< "Ingrese codigo de area: ";
    cin>> codigo;
    cout<< "Ingrese duracion de llamada: ";
    cin>> minutos;

    if (minutos <=1:00)
        minutos = 1;
    else if (minutos =2:00)
        minutos = 2;
    else if (minutos <=3:00)
        minutos = 3;
    else if (minutos <=4:00)
       minutos = 4;
    else if (minutos <=5:00)
        minutos = 5;

    switch(valor){
        case 8: valor = 6;
        break;
        case 12: valor = 4;
        break;
        case 15: valor = 8;
        break;
        case 20: valor = 6;
        break;
        case 22: valor = 7;
        break;

    }

    costo = minutos*valor




    }


        return 0;
}