I was offered only two timeslots to come in for an in person interview.. and when i asked to come in the fiollowing week when i was more accessible, I was declined and told they are filling the position by the end of the week. So i juggled my schedule and came in. Didn't get the job, and guess what? the same position was advertised 2 weeks later, for another 2 months.
Please work with people's schedules. I understand it's the employer's market right now, but courtesy and respect goes both ways.