Bake until slightly cracked on top and just firm to the touch, about 15 minutes. (foodista.com)
It tends to help the cheesecake bake more evenly and not crack on top, but you can definitely bake it without the water bath if you prefer. (browneyedbaker.com)
It is done when it starts to come away from the sides, there are little cracks on the top and it is going a light golden colour. (veganetcetera.com)