I've only had one instance where I was interviewing while unemployed. All other times, I simply took a couple of hours off work and went off to the interview. I usually would work a little bit extra in the days leading up to the interview and not have to worry about not putting in my time. When I interviewed last, both of my interviews were on a Friday. My former employer had casual Fridays, so the only thing I had to put up with was changing clothes once I was done with the interview. If I waited until I was unemployed before interviewing, I would miss out on a lot of opportunities.