With G18 skills and content can we...

There's a difference between rounds and phases...just saying. The quality of the Blue scale goes up as more rounds are cleared. Any phases, partially completed or neglected, do not count and always rounds down.

Getting to round 4 is hard as is and can take hours...since there is no time limit, be prepared for a grind. On average, the group I was in took approximately 15 minutes per phases. Getting to 14 with that time (on average) is 3 anda half hours of my life sitting in front of the same screen, killing the same waves for 98 phases, which spawned about 200~ waves? You would need an extremely dedicated party to stick around that long...