Revenue for a sampling of Chicago law firms grew 6.1 percent through the third quarter as the total number of billable hours showed the highest increase in the country, according to a new survey. The Citi Private Bank legal industry survey included a total of 178 law firm participants, comprising global, international, national and regional firms. The Chicago results came from 11 firms, whose names were not disclosed in the survey. The revenue growth in Chicago, comparing 2014 to 2013, is the third-largest such …