Hi, Once you have known the technique, you can fill it quickly. Firstly, you should take air sofa out from the bag, and then spread it out. Secondly, open one of the mouth of air sofa and fill it with air. Please fill it in a straight line! Please do not run in circles with it. At last, close the mouth before you stop filling in case of wind leakage and then repeat it several times. Roll up the closure at least 4 circles. The tighter you close your sofa, longer it will stay inflated.