Its not. Every 10-12 days is appropriate, at the longest.
I mean you could inject 6grams of any ester and because of the sheer amount, your blood levels would be quite high for a long time. But the steady decrease will probably be noticeable and I dont think that's desirable.
With an 11 carbon chain the release wouldnt even be twice as slow as cyp. I dont think you'd enjoy the fluctuation in blood levels of injecting cyp once every three weeks, as an imprecise analogy.
But if you just want a gram per week of test, I think its pretty simple to take two 500mg injections of enanthate or cyp every week. With an 8 site rotation thats hitting each site once every 4 weeks.