“When Apple released the highly anticipated Mac OS X 10.4.9 update on March 13, 2007, it marked the longest time between any Mac OS X version. It took Apple 165 days to release the update, or in other words, five months and thirteen days,” Switch To A Mac reports. “Does 10.4.9 mark the last and final update to Tiger?”
Full article, including a chart detailing all Mac OS X version release dates and number of days between versions, here.
Apple releases Mac OS X 10.4.9 – March 13, 2007