Yes, waiting for a long time can be a problem, especially if it's unnecessary. Like, if a friend cancels on me and lets me know, that's okay, these things happen. However, if they don't show up and don't tell me for an hour, that's not okay. It's not so much the waiting that's an issue, but the fact they didn't consider my time. I consider myself patient, so waiting itself isn't usually a big deal for me.
네, 오랫동안 기다리는 것은 문제가 될 수 있습니다. 특히 불필요한 경우에는요.