Retractation settings ?

[mediaklan]

Hi everyone !
Here's a question ^^.
I'm using MatterControl for quite some time, and I love the software. I played with some settings but now I can't remember what I'm supposed to put in this setting, considering my printer, a Geeetech Prusa i3 Pro B :
"Retraction - Lenght on move :
The amount that the filament will be reversed after each qualifying non-printing move."
I'm supposed to put something here in mm ... The closest setting I could find in Slic3r made me guess it could be 2mm.
Am I right ?
Thank you in advance !

[Mark]

Yes, it is the same setting.

[mediaklan]

Thank you ! I will give it a try then !