Ok so you have decided to build a Mavor, Paragon, Scathis, Salvation or Yolona. Highly expensive time consuming game enders to build.
I suggest a minimum of 500 mass per second. And be overflowing energy by at least 6k per second.
I appreciate that the longer you wait and keep ecoing up then the quicker the game ender will be to build but over ecoing means you probably aren't helping your team with any battles and if you wait too long then the enemy can start to bring strong pressure against you, possibly with multiple T3 heavy arty etc.
When do you consider your eco to be strong enough to start?
Just curious for everyone else thoughts and opinions.