I guess the closest we have is usage rates, and of course that is not a direct correlation because it doesn't necessarily measure possession time.
And usage rates amongst the top players are a fair bit higher now than they have historically been. I attribute it to spacing which allows a top player to shine more easily.
Usage rates for each of the last 10 years, based on ranks.
#1, #5, #10, #20
2024 - 36.0, 32.3, 30.8, 29.3
2014 - 33.0, 29.8, 28.3, 26.9
2004 - 35.3, 30.2, 28.5, 26,5
1994 - 32.0, 29.0, 27.1, 25.5
Add tempo increases, efficiency increases, and usage increases and we are getting gaudier gross stats than ever.