How long the sofa can keep the air ? Between 2h to 6h. Depending on how you use it. If you get up and sit several times, the air comes out faster, but if you lie on it calmly, the sofa keeps its air much longer. It is preferable to sit gently on it and not to let you fall, so the sofa will remain inflated longer.
How much weight the sofa can support ? The sofa can support up to 550 LBS/250 KG.
What if the sofa deflates fast ? It's because the sofa was not inflated propely. Each sofa is tested over a period of 2 hours before it is sent in order to check there is no leak of air. The most important is to roll 4-5 times the PC black strip to keep the air.