Lantus (insulin glargine) lasts for more than 24 hours?

glucosy

Newbie
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I feel like the effect duration of Lantus (insulin glargine) is longer than 24 hours, rather several days. This is obvious when making dose adjustments or accidently skipping a dose.
The effect diagrams of Lantus I've seen are stopped at 24 hours, even though the effect still seems to be at the maximum plateau by then.
I know Lantus is metabolized into M1 and M2, of which the former is the active metabolite, but for how long?