Nickole Gambrill is still paying the price for graduating college at the wrong time. She and other students who earned diplomas in the aftermath of the deepest U.S. recession since the 1930s are experiencing an earnings hangover that could last a lifetime, even as the labor market heals. Gambrill accepted the first paralegal job she could get after finishing classes at Towson University in Maryland in December 2010, when the unemployment rate was 9.4 percent.