Why doesn’t my Puzzle Rush score show on the Global leaderboards?

I just scored a 51 in puzzle rush (survival mode with unlimited time). I averaged :21 seconds per puzzle, and 51 would be the second best score this hour and in the top 50 for the day.

The score shows in my personal leaderboard, but not in the Global leaderboard. Why is this? Have other people noticed this?

I don't know what the answer is, but I've seen this before.

Phenomenal puzzle performance, bravo Smyslov Fan!

There seems to be some sort of time limit to complete the Puzzle Rush Survival. I haven't been able to figure out yet exactly what time limits are in place for the Hourly and Daily leader boards. Daily seems to be at least 90 minutes and Hourly might be below 60 minutes or even shorter.