Well I know that it took me longer to learn how to ski than to snowboard. I feel like the balance required for skiing and snowboarding is similar. I just know that after my 2nd day riding on a snowboard, I felt somewhat comfortable. Maybe I'm overconfident, but I feel like I'll learn quickly, so that's why I asked whether or not I should upgrade my equipment after only 2 days of riding.
No need to return anything unless you want to upgrade the bindings. You've ridden for 8 hours. you're a beginner. Riding 4 hours once a week is not riding a lot at all really. At that pace it will probably take you at least a season to progress out of that gear.
Also, longer/stiffer boards are not always an upgrade. A shorter/flexy board will help you improve better since those boards are easier to control. A high-end freeride board will hurt your progression, not help it.
Wouldn't having a long/stiffer board make me a better rider? Sure, it would take me longer to learn as a beginner, but wouldn't it make me learn how to be precise with my control?