Running it 7 days per week is optimal. Some people will only run it 5 days per week to try and cut costs and let their bottles last a little bit longer. If you can afford it, run it 7 days a week for 12-16 weeks before taking a 4-8 week break.
7 days per week is definitely the best way of running it - you want to have the most stable levels possible of the active substance in your blood. This rule migh apply to such compounds as clenbuterol for instance, where you need to give some time for your receptors to get upregulated again, but this is definitely not the best way of doing things with Nutrobal.
its a GH pulser.. you can run it at your leisure whenever you want to.. it will ADD to your existing GH, without suppressing it like exogenous GH would.
obviously if you want optimal results you want to run it AM/PM daily.