timecalc.js

var regex = /\d+/g;
var hourCount = 0;

jQuery("td.timeoriginalestimate").each(function(){
	var origTime = jQuery(this).text();
	if (origTime.indexOf("hours") > -1) {
		var results = regex.exec(origTime);

		if (results) {
			var numresults = results.length;

			for (var i = 0; i < numresults; i++) {
				var result = results[i];
				hourCount += parseFloat(result);
			}
		}
	}

	if (origTime.indexOf("days") > -1) {
		var results = regex.exec(origTime);

		if (results) {
			var numresults = results.length;

			for (var i = 0; i < numresults; i++) {
				var result = results[i];
				hourCount += (8 * parseFloat(result));
			}
		}
	}

});

console.log("Total Development time: "+hourCount);