Hmmm... your post was thought provoking...
A “line” would indicate a “wait” for some finite resource.
Just as the Holy Spirit can fully indwell all of us at the same time, I don’t think there will be any “line” on judgement day. The Lord will have all the “time” necessary to fully judge all of us with no waiting.
“Infinite resources, no waiting!”
(not criticizing you, just thinking “out loud”)
Neither you, nor I, really know if there will be a “line” or “a mob” all at once. That is HIS business. We can only speculate.