How many levels are there for Portal 2?

Answer 1

Considering the game has not been released, the exact number of levels have not been announced or leaked. However, it has been stated by Valve that it is roughly twice as long as the first Portal.

Answer 2

You will get around 10 hours of gameplay. Levels are not known.

And there is also co-op now so it should last for some time unless you hate the game.

Answer 3

The game has now been released, and apparently there are 22 chambers/levels with many other plot sections and areas.

Answer 4

There's 22 SP levels and I think theres around 30 co-op areas.