Jobs did not run on a fixed annual schedule like Tim Cook does. Mac OS X 10.3, 10.4, 10.5, 10.6, and 10.7 all took over 12 months to develop, sometimes much mo

Jobs did not run on a fixed annual schedule like Tim Cook does. Mac OS X 10.3, 10.4, 10.5, 10.6, and 10.7 all took over 12 months to develop, sometimes much more, and 10.5 was famously delayed out to 30 months. Jobs may have pushed engineers, but he was more careful about what he pushed out the door to consumers.