How to display timing with app.alert.show(id, options) to display message for 10 seconds?

How to display timing with app.alert.show(id, options) to display message for 10 seconds?

Currently it is displaying message for around 3 seconds only.

When I set the option "autoclose:false", the message never disapper, but I dont want to use that.

I want to show message for 10 or 15 seconds, and then disappear.

I have gone through http://support.sugarcrm.com/Documentation/Sugar_Developer/Sugar_Developer_Guide_7.5/API/Sidecar/Alerts/index.html

but no option for timing.