... (for water walking balls)A: 15-20 minutes, just change the air inside the ball at least every 30 minutes ... . We can make Transparent zorbs, Colorful zorbs, Color dot zorbs, Color Entrance zorbs, Color string zorbs, Aqua zorbs, Zipper zorbs, Glow ... zorbs, Nuclear zorbs, Logo zorbs and other Customized zorbs...Customizable: Color, string rings, entrance, strings, harness, zipper, logo printing, ...