I have never had a problem with eq or deca and my nuts. In fact the best bet is to always use some test with those drugs. That will help keep you up and running. However, I have never had a problem with deca t 600mg a week, nor eq at 450mg a week.
I would say around 4 weeks. If it does help your appetite that is great if you are bulking, but try using that, test, winny on a cutting diet you are fighting the hunger pains while keeping cal's to a minimum. That really sucks.
As far as your nuts shutting down, any roid that increases your test levels will cause a reduced output from your testicles. However, with some HCG at the end you should be fine. Also, while some will debate this, if you use clomid eod and some proviron and nolvadex, this should help keep your nuts online during the cycle as well as prevent some possible gyno.