FORTUNE -- When a house sits on the market for a while, we tend to think the people who passed on it rejected it for a reason. The same goes for a job, especially an executive-level one. If a CEO position stays open for too long, it could indicate a couple of things, none of them all that promising to a potential candidate. Sears had an "interim" CEO for three years, until Lou D'Ambrosio took over this past May. Lloyds Bank (LYG) CEO António Horta-Osório recently stepped down claiming it was on account of chronic fatigue, and the company's interim CEO, Tim Tookey, plans to leave at the beginning of 2012. If Horta-Osório doesn't feel better, Lloyds will bring on a replacement interim, CEO David Roberts.