I have a wizard sequence in my website and I want to know the time used for users to start the wizard and finish it. That way I could know which page can be optimized or something like that.
Can we use Google Analytics for this?
In Universal Analytics you can create own dimension and metrics. More about: https://developers.google.com/analytics/devguides/platform/customdimsmets
You can push data to analytics on page loading (when user comes to the wizard) and when ends it (by clicking "finish" or something like that). If you send time of entrance and time of exit, difference will be a time on site.