How much space should I keep free?

[sdneidich]

Hi! I have a MBP 2011 with 128 Gb SSD.

I was wondering how much space I should keep free on it... I want to add a Windows 7 partition, but am concerned about space. thanks!

 

[DarthDarko]

As a general rule you should keep 10% of your total drive space free

 

[Ktm.Moto]

How much space do you have left? I am looking to get this setup but can't seem to think 128Gb will be enough.