I think we might be mixing two types of “boxing” gyms. The gym that is open all day or as soon as the owner gets off his paying job and opens. A place that while it has training times, is open anytime for any member to come workout. The other is the gym that has set hours and group training. The first is my experience and a good place to learn to box (if you can find one that will train non-boxers). The second sound more like a big box fitness gym and does little actual boxing, sort of like the strip mall kick boxing chains.