Here’s something that happened:
A few weeks ago, I applied for a job with a local nonprofit. The next day, Thursday, at lunchtime, I got an email from HR: “We’d like to schedule a phone interview next week. Please reply and let us know three time slots you have available from Monday to Thursday.” No length of time was specified, so I gave as broad a range as possible – a total of nine hours spread out over two days. I waited all afternoon, but got no response. No response the next day (Friday), either. Since interviews were going to start on Monday, I was a little concerned, but figured it was okay since the days I gave didn’t include Monday. And maybe the HR person was swamped and going to be working over the weekend. So I waited and sent a quick follow-up email on Sunday. Monday morning came and went, and still nothing. At 3:00 I called the HR person (his direct phone number was in his email signature). It went to voice mail, so I left a very polite, brief message. Tuesday came and went; no response. On Wednesday afternoon I called again, and left another brief, polite voice mail. I also sent another follow-up email.