This is an example from my coding bootcamp, to create a function to print the day according to the input (1 to 7). But my code is disapproved

Question

function returnDay(day) {
while (day > 0 && day <= 7) {
    switch(day) {
        case 1 :
            console.log("Monday");
            break;
        case 2 :
            console.log("Tuesday");
            break;
        case 3 :
            console.log("Wednesday");
            break;
        case 4 :
            console.log("Thursday");
            break;
        case 5 :
            console.log("Friday");
            break;
        case 6 :
            console.log("Saturday");
            break;
        case 7 :
            console.log("Sunday");
            break;
    }
}
return 0;

I used switch statement and while loop. But it says my code took long to execute.

My code was disapproved. What happened here?