For those left behind by the long, slow economic recovery, time is running out.

More than four years after the recession officially ended, 11.5 million Americans are unemployed, many of them for years. Millions more have abandoned their job searches, hiding from the economic storm in school or turning to government programs for support. A growing body of economic research suggests that the longer they remain on the sidelines, the less likely they will be to work again; for many, it may already be too late.

...