Foxconn Technology Group has come up short in trying to limit the overtime hours of its workers in China, but still made progress in improving the working conditions at three of its factories that make products for Apple, a labor group said Thursday.The iPhone manufacturer has completed nearly all the goals in its plan to improve conditions at the three factories, according to a recent audit from the Fair Labor Association. But the manufacturing giant is struggling to cap workers' overtime to the Chinese legal limit of 49 hours per week.Workers at the three factories located in Shenzhen and Chengdu are instead generally working less than 60 hours per week, meeting the FLA's own code on labor standards. Only for a seven-week period at one facility did working hours exceed 60 hours.The plan to meet the 49 hours per week limit was an