How soon will visitors show in my experiment results?
I thought it was almost instant, but I created a test about 30 minutes ago that I have visited a few times to make sure it's working, but Optimizely is showing 0 unique visitors. The content is changing on the page like it's supposed to.
How can I make sure that it's recording visitors properly?
According to Optimizely, visitors are included as follow:
"When visitors are bucketed into an experiment, they receive an optimizelyEndUserID cookie. This cookie is used to determine whether a unique visitor has been included in an experiment."
Your best bet is to QA the experiment using the force preview mode, and checking that your tracking has been implemented correctly. You can also force yourself into certain Optimizely buckets to ensure your visitors are seeing what you expect them to see.
I agree with Robert's recommendation to use force preview mode to QA an experiment but I can also take a look at your experiment if you willing to provide the title of the experiment.