Final answer:
The duration it takes for a RipStik wheel to wear out varies, but with usage every other day for 4 hours, it can range from a few months up to a year, influenced by factors such as wheel quality and riding surfaces.
Step-by-step explanation:
The lifespan of a RipStik wheel when used every other day for 4 hours can vary widely depending on several factors including the quality of the wheels, the rider's weight, riding style, and the surfaces on which the RipStik is used. Normally, under such usage, the wheels may last anywhere from a few months to a year before needing to be replaced. However, aggressive riding or rough surfaces can wear wheels out more quickly. It's important for riders to regularly check their RipStik wheels for wear and tear to maintain safety and performance.