I ran it once for 10 weeks at 50mg/ED for 5 weeks and EOD for the next 5 weeks. For me, front loading and backing off halfway in helped with the joint pain. I wouldn't go any longer. I've heard of people going twice as long.
I never experienced insomnia either. I have a good friend that told me he had heard of someone going as long as a year without side-effects. Personally I think that's F-ing crazy. I've had a hard time finding info that says there's anything wrong with prolonged cycles. As long as you keep your liver healthy, I don't think you have much to worry about. I did have some liver damage symptoms from oral winny during a six week cycle 50mg ed. Now I'm sticking with injections and plan to go eight weeks and thus far (two weeks) have had zero negative sides.
I prefer to run it untill my liver, and cholesterol is fucked. and then keep going alittle longer until i tear some ligaments apart. haha
but for real. about 8 weeks at 75 ed. Joints were hurting though. Took awhile afterword for the aches and pains to go away. I would just liston to your body. I love it for vascularity.