It's always tough to tell how long they have left without knowing how long they've been in flower and what strain they are. Most indica plants fully flower in 8 to 10 weeks, and sativa plants take longer, 12 weeks or longer.

Just a ballpark guess I would say your probably 3 to 4 weeks into flowering, so you've got a good month, 5 weeks to go. Hope this helps.

Great looking plants by the way!