Tennis Ball Machine Hopper Time Calculator
Calculate time from the first to last feed using the number of tennis balls loaded and the seconds between feeds.
Enter a whole number of balls (1–1,000) and an interval (0.1–60 seconds).
Calculation: (balls − 1) × feed interval. Startup delay, pauses, retrieval time and misfeeds are excluded. This estimates a feed batch, not a recommended exercise duration.