Given the ball's distance of ~8000km above the Earth in the shot, 11.186 km/s this means ~715.18 seconds, or about 12 minutes, passed between panels.
Now, this is still an assumption, and since this was the last shot of the Volleyball Game before it cuts to Yor having tea with Melinda and her friends, it's quite possible that that was the last serve of the game, and 20 minutes, 30 minutes, or even an hour passed between the panel of the ball blowing through the roof of the sports hall and the panel of the ball in space, but at 12 minutes betweent the panels, this feat has already been lowballed into the ground.
If you wanna remove the Calc and wait for S2 for a solid timeframe, then fine, but I think it's alright to keep using the current assumption for now given how conservative it already it.