How many room cards can a standard room in a Japanese hotel have?

Usually give two room cards, each room 1, which is actually inconvenient. For example, if you go back to your room to sleep at night, your roommate goes out to play, and you go back to your hotel room in the middle of the night, you can open the door with another 1 room card. He has been lying in bed, half asleep and half awake, which is really scary. Did a thief come in and hurt himself? For safety, another example, if you have left your room. ? If my roommate returns to her room in the middle of the night, she can't open the door with her room card. It is necessary to wake you up when you are dreaming, get up and open the door to let him in. Then you really feel bored and unhappy. So having two room cards is not very important. The most important thing is to see if you are lucky. Did you find someone with a good spelling to tell you a painful past when I joined a group and slept with that stranger? It turned out to be a super-high bass, which kept me awake all night. I can't do anything to him, and I can't lie on the cold corridor floor outside the house. So I have to put up with it ... good luck first.