Keeping it open for 2 more hours should be manageable and it would be a little easier for the staff to handle. This two hour window would help people that have classes till 7, have to handle club activities, events, cook for themselves and cool down a little before hitting the gym.
Since 6.30 am would be a little difficult for students that have 9-9.30 am classes. I hope this would be an amicable solution