I don't think it's enough personally. Especially if you're nervous while driving, you won't be as focused and might make mistakes.
When I got my license here it was mandatory to have 50 logged hours, before you're at the stage where you can legally drive alone without someone licensed supervising. Then they made it 120 hours.
I think both are excessive but either way 6 hours doesn't seem like enough to me. Of course its up to whether you pick it up easily, but even so you'd need to spend those hours in varied conditions so you've experience with different lighting, weather, and traffic situations, otherwise you'd be in for a shock if you ran into something you hadn't practice with.