What are you basing this on? Gut feeling?
There are several ultra slim cases that are around 0.4mm, so the camera still sticks out slightly.
In answer to the OP's question, any case that is 0.8 or 1mm thick or more should come out past the lens. If you're not sure about a case, do a search in this forum for it. Chances are someone else has tried it and could tell you.