These early buses run a bit less frequently than the regular buses do. If it's an EMH morning at MK there will be more frequent buses, so you don't have to leave so early. So...if it's an EMH morning, I would be at the bus stop by 7:15-7:20. If it's a regular 9am opening, be out at the bus stop by 7ish..that way if you just miss the previous bus, you won't be late when you have a wait of 20+ mins for the next one.