How would I make this function repeat? [duplicate]

I'm making a random character generator, and I have everything except for the repeat function; I'm trying to get it to repeat every 1-5 seconds.

function makeid(length) {
    var result = '';
    var characters = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789~`!@#$%^&*()_+=-,.<>/?{}[]|';
    var charactersLength = characters.length;
    for ( var i = 0; i < length; i++ ) {
        result += characters.charAt(Math.floor(Math.random() * charactersLength));
    } return result;
}
console.log(makeid(8));