only extend 5mins if less than 5mins left

src/middleware/middleware.js

@@ -206,7 +206,11 @@ middleware.isAdmin = function(req, res, next) {
 
 				var loginTime = req.session.meta ? req.session.meta.datetime : 0;
 				if (loginTime && parseInt(loginTime, 10) > Date.now() - 3600000) {
+					var timeLeft = parseInt(loginTime, 10) - (Date.now() - 3600000);
+					if (timeLeft < 300000) {
 						req.session.meta.datetime += 300000;
+					}
+
 					return next();
 				}