Yeah 2 weeks is quick, but I’ve never been much of a studier so 2 weeks is probably the most I’d study anyways. I studied for the SAT’s by doing one practice exam the night before. 
Plus the time crunch will help motivate me to keep my balls to the wall, so to speak.
I’m pretty much just expecting to spend time learning the in’s and out’s of the test format and remembering how to write a coherent essay. This is partly based on arrogance and partly on input from friends who have taken the GMAT within the last couple of years.