This is turning into a very interesting thread. Slightly off topic but entertaining.
I guess I can see him hitting 1,500 in a day, every now and then, but not every day. Sure, he may be able to pick up a ball, drop it, pick his target, line up, wiggle his butt, swing, hit the ball and watch it it land within 20 seconds. Just.
But all day, every day? A rate of 3 per minute is 180 per hour which will need 8.20 hours to play them all. Then add lunch, toilet breaks, moving to the pitching and putting practice area, occasionally asking Fanny why she thinks a shot didn't work quite as intended, there are a myriad of little things that all rob you of a minute here and there.
Occasionally, sure, I imagine he did whack his way through 1,500 balls but I doubt it was his normal routine. I imagine even someone as physically robust as him would struggle to do that on a regular basis.
And nothing of what I've written is intended to knock Sir Nick, I have huge respect for him and his ability. I also think very highly of him as a human since watching a program dedicated to Seve a while ago and seeing Nick have to take 2 goes at speaking to camera due to the emotion of the situation. He's not the heartless terminator he sometimes appears to be.