It’s not half the time it takes to decay, it’s the time it takes for half the substance to decay, it’s more like halving-life
the reason you can’t measure the “full life” is because it’s exponential, the more you have the faster it decays, the less, the slower, which is why it takes the same time to decay one half no matter the size you have
So you can basically keep dividing in two forever, after 2 half-lives you have 1/4 th of the original, after 3 you have 1/8 th and so on, since there’s a huge amount of atoms it’s almost impossible for them to all decay
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