True, but you weren't specific. You said 8:30-9:30, but he doesn't know where you live. If you're on the east coast of the USA, for instance, Mukka lives in England. So 8:30pm for you is 1:30am for him X_x not exactly a great time for him to battle on a weekday.
Be specific, tell him your time zone and pick a time that's good for both of you.