As long as you have signed up in advance, you may enter and exit the classroom at any time during the class.
A class will be closed to new sign-ups at the scheduled start time, so please sign up for your classes in advance.
Your instructor may also set a cut-off time for sign-ups for their classes. If you can't find a time on your instructors studio page, please email them and ask them to change the cut-off time so that you may sign up. An instructor cannot change the class setting to allow you to sign-up late, however, may be able to create a new class time for you if no other clients have signed up for that class.