Recently, the conversion from a fuel-based vehicle to an electric vehicle (EV) has a positive effect in various aspects, and as the EV supply increases, various problems regarding the experience of an EV charging infrastructure are also increasing. Among them, the biggest inconvenience that users experience is the "long charging time (46.3%)" that occurs when using charging stations, and additional waiting time is required if the charged EV occupies the space for a long time. Against this background, this study aims to improve the user experience by identifying and minimizing the factors that delay the 'charging time'. Therefore, the purpose of this study is to identify the factors that delay EV charging time in the current infrastructure and to minimize them to establish design guidelines to give EV users a smooth charging experience. The research objectives to achieve this are as follows. First, we define EV charging times through literature surveys and preliminary surveys, and establish user experience survey templates for systematic user research. Second, user research is conducted to define user challenges when users are charging EVs. Third, we establish a design strategies and solutions that can shorten EV charging time.