It is easy to get hired if your interview goes well and most people on the panel like you or feel that your skills match well or well enough with the job requirements. The entire hiring process takes about 2-4 weeks. I am pretty sure this timeframe includes the background check and drug testing. I am not sure of all the steps because I have been employed here for many years and the process may have changed since I was hired.
Sometimes the work pace is frantic. All data is due yesterday! It seems the due date for data is so important that the management stresses you to death about test results. Other times the pace of work is slow and you find yourself assisting other people do their work.