It says that its just a tryout. How long do tryouts last? Is it really a tryout or did it just say so?

It really is a tryout. Tryouts last 30 days

It is just a tryout. It asks you for the key for thirty days before shutting down.

The tryout time is 30 days and at the end of the free tryout the cost will be $????? to purchase the Adobe Photoshop.