How far off from flowering?

[sexycybe]

This is my first grow so please take that into consideration
These girls have been flowering for quite a while (maybe 6-7 weeks?)
They are all at slightly different stages due to different locations.
I can't determine which plant is which, im just after a general answer for a couple.
Could somebody please help me by letting me know how many weeks away some of them are from being ready to harvest. I am yet to track down a 30x magnifier.
Sorry for blurry images :S
The strains are blue mystic and northern lights.
Thanks for any help, SxC

 

[Lester Freeman]

Nice plants, looks to be another 40-50 days roughly. The ripening rate will be influenced by the weather. Have patience, you will be there soon enough