Question during rewatch

I’m on my first rewatch, I am on episode 2 and forget if they ever cleared up why people showed up in the boarderlands days after others?

Why did Shibuki arrive days before Arisu and friends? And that frightened confused guy during “tag” showed up almost a week after Shibuki.

The guy who called it quits during ep 1 seemed like he had been in the boarderlands for a long time, and felt like it was never going to end no matter how many games he cleared.

Do we know the exact time logistics? How long 1 day in the boarderlands is compared to time on earth? Did the people who got to the boarderlands before others just enter into critical condition earlier/faster than others?

Basically, can someone remind me of the timeline?