diff --git a/lib/unshortener.js b/lib/unshortener.js
index 351de2d..5273178 100644
--- a/lib/unshortener.js
+++ b/lib/unshortener.js
@@ -6,6 +6,7 @@ var hash = require('node_hash');
 
 var options = {};
 var memclient;
+var urlLifetime = 1000;
 var map = {
     bitly: {
         'hosts': ['bit.ly', 'j.mp', 'ericri.es', 'jc.is', 'nyti.ms', 'rww.to', 'linkd.in', 'win.gs', 'dai.ly', 'imgry.net', 'mln.im', 'theatln.tc', 'rvtra.de', 'amzn.to'],
@@ -41,6 +42,9 @@ exports.config = function(opts) {
    if (typeof(opts.proxy) !== 'undefined') {
         request.defaults({'proxy':opts.proxy});
    }
+  if (typeof(opts.urlLifetime) !== 'undefined') {
+    urlLifetime = opts.urlLifetime;
+  }
 }
 
 exports.expand = function (url, opts, callback) {
@@ -73,7 +77,7 @@ exports.expand = function (url, opts, callback) {
 exports.saveUrl = function(url,result) {
     if (memclient) {
         result = (typeof(result) !== 'undefined') ? result : url;
-        memclient.set( hash.sha256(url.href), JSON.stringify(result), 1000);
+        memclient.set( hash.sha256(url.href), JSON.stringify(result), urlLifetime);
     }
 };