The phrase "entire lifespan" refers to the entire period of time from when something or someone is born or created until it dies or ceases to exist. Full definition
Instead, purchase a cage suitable for the hamster's entire lifespan at the start, as this will save you money and bring much stress - relief in the future. (wikihow.com)
With a world as large as ED's, you also have the added joy of knowing that it's very possible those worlds would have gone undiscovered entirely during ED's entire lifespan as a multiplayer title, were it not for you. (thatvideogameblog.com)
That's not bad considering last year's movie, Naruto Shippuden: Blood Prison, grossed about $ 9.0 M USD total in it's entire lifespan at Japanese theaters! (animegamesonline.com)