Yes, why not? For many people taking time off their existing job during the work day to interview is difficult, but they find a way to do it.

My whole point in this thread is not that interviewing isn't onerous, or that some companies may require more of a time investment than some people are willing to make (and, if that's the case, it's fine to say that job/company isn't for you). What I find obnoxious is when people turn their unwillingness to spend time on the interview or homework as "you are discriminating against me because I am older or because children."