[member="Darth Kentarch"]
I'm hesitant to provide you a number on this. Largely because the rules are in place to endorse common sense and stray away from anything becoming a numbers game. I.e. If someone says an army is 100,000 then 90,000 somehow isn't. This is the wrong way to look at it.
If you need guidance, I would suggest taking a look back at the recent invasions that have included fleet or army restrictions. If your number is approaching that of the entire major faction allowance, then obviously you've hit your stride.
As the Supreme Court states, we can't define it but we know it when we see it. It will be up to the discretion of the judge at the time to dictate what's appropriate and may be based on the quality and balance of the sub, any pertinent development that's been done, and how comfortable the judge is with the submission in general.