Humana Expects Delay to Exchange Enrollment

   Nov 6 (Reuters) - U.S. health insurer Humana Inc said on Wednesday that it expected a delay in the enrollment period for the state-based health exchanges and was waiting to hear from the government on how it will proceed after a rocky start to this marketplace.    ``Our assumption is that there will be an extension to the open enrollment period,'' Chief Operating Officer Jim Murray said during a call with investors to discuss quarterly results.