JSFiddle - React, Tailwind, and code Playground

HTML

<script>
   
    function Tiempo(){    
        var input = document.getElementById("AutoUser")[0],
            intervalo,
            disabled = function(){
                return setTimeout(function(){
                   Desactivar();
                }, 1500);
            };
        
        input.addEventListener("keyup", function(){
            clearInterval(intervalo);
            intervalo = disabled();
        }, false);
    
}
    
    function Desactivar(){
     document.getElementById("AutoUser").disabled = true;
    
    // MAS FUNCIONES AQUÍ
    
    }
</script>




Campo Uno: <input type = "text" id="AutoUser" onKeyUp="Tiempo();" />
<br>Otro Campo que no me interesa: <input type = "text" />

CSS

input{
    width: 15em;
}