#1
I have got Rusty Cooley's The Art of Picking, Shred Guitar Manifesto and Extreme Pentatonics. How should I work on these DVDs to improve my technique? Like for how long should I work on a set of exercises before moving on? How should I use metronome etc.

Would really appreciate your help.
#2
I'd say you should work on any one exercise until it sounds like Rusty playing it.
Bruh? Brah? Breh? Bruae? Bruae.
#3
Work on the exercise until you are satisfied with the speed and articulation of each lick. practice an exercise for 5 minutes, take a 5 minutes break and do it again.
Gear:
Dean RC7X (Bareknuckle Coldsweat pickups)
Ibanez Rg2570Z (Bareknuckle Juggernaughts)
Schecter KM-6
Schecter Hellraiser Hybrid 7 String
Engl Powerball II
Orange PPC412
Line 6 Pod HD500X