This worked really well. I needed to generate a random duration to pass to a Wait for Duration Flow operator. I added on you script, but kept the original as it makes the Action more versatile for other uses:
(function execute(inputs, outputs) {
var min = Math.ceil(inputs.min);
var max = Math.floor(inputs.max);
var result = (Math.random() * (max - min)) + min; //max excluded, min included
var minutes = Math.floor(result).toString();
//duration in minutes
var duration = new GlideDuration('00:'+minutes+':00');
outputs.resultdecimal = result;
outputs.resultint = Math.floor(result);
outputs.resultstring = Math.floor(result).toString();
outputs.resultduration = duration;
})(inputs, outputs);
