Welcome to planDisney, Jessica.
I recently came back from Walt Disney World Resort and had the grooviest (or should I say, Groot-iest?) time riding
Guardians of the Galaxy: Cosmic Rewind in
EPCOT. Everything about this attraction, from the immersive queue full of Easter eggs to the funky music to the out-of-this-world thrills makes it my new favorite ride. Here's a tip: for a more intense experience, sit in the back!
At the moment, there is no standby line option to experience this attraction. You can either purchase an
Individual Lightning Lane entrance (from 7:00 AM on the day of your visit if you're staying at a Disney Resort) or join the
virtual queue. There are a few different windows that open for the virtual queue. The first is at 7:00 AM, the second is at 1:00 PM, and the third is at 6:00 PM on select dates during extended evening theme park hours. This is a benefit for registered Guests staying at a Disney Deluxe Resort, Disney Deluxe Villa Resort, or other select hotels.
Disney has been using the virtual queue system over the last couple of years for new attractions that are very popular. It's difficult to know how long Disney will use the virtual queue system for Guardians of the Galaxy: Cosmic Rewind. They used it for nearly two years for
Star Wars: Rise of the Resistance, but only a few months for
Remy's Ratatouille Adventure. Since you're traveling in September, I would personally anticipate this system still being in place. However, who knows?!
Either way, I hope you manage to experience and enjoy this great ride, Jessica! It's save the galaxy time!
Mike