The maximum recommended pressure is 10 PSI. Filling past 10 PSI will void the warranty and may cause irreparable damage to the Tub. Using the included dual-action manual air pump it takes roughly 2-3 minutes to inflate The Edge Tub Legacy and 3-5 minutes to inflate The Edge Tub Elite. Using the electric airpump it takes roughly 4 minutes for Legacy and 6 minutes for Elite.