Sorry to占用你的时间, but it seems there might have been a typo in your request. Assuming you meant "Sorry to take up your time," here is the article:

Sorry to take up your time, but I wanted to express my gratitude for the opportunity to communicate with you. Despite any inconvenience my request or questions may have caused, I sincerely apologize for any trouble I have brought upon you. Your patience and understanding are greatly appreciated.