That's how many real games it will take to evaluate Rodgers, according to Mike Lombardi over at the National Football Post. Lombardi makes a great observation in response to a quote in the Journal Sentinel from Reggie McKenzie regarding Rodgers' mechanics in the pocket:

All this talk about feet, backpedal, and arm, are meaningless if the mind does not make quick decisions.  I’d rather have a quick mind over quick backpedal any day.  What Rodgers is going through right now is the learning curve. More importantly, what the Packer coaches are going through is learning what Rodgers can do now to help them win and what can be put off for awhile.  It’s only going to get worse as the pressure and the new blitzes start on opening day.  Right now the whole Packer playbook is not at the disposal of the Packer coaches.  They have to go slow and bring Rodgers along.  This is a new era for everyone.  Rodgers needs to improve his ability to make quick decisions.  And don’t forget the ten-game rule for evaluating quarterbacks.  It will take us ten REAL games to really know what Rodgers can and cannot do.

Does this mean that we'll know if Thompson and McCarthy made a mistake in entrusting the team to Rodgers by November? No. It means McCarthy will have a pretty clear idea of where Rodgers' strengths and weaknesses lie when it comes to the pro game.