I'm over 9 months in, and halfway through, my first tip.
I only use the device for annotations and notes that have a short lifespan though (my contribution to paper waste). I'm keeping a paper notepad for more important writing (work/study) with it to spare the tips as much as possible. People have reported that they go through a tip within a month when they use the device as a full-on paper replacement, which I 100% believe can be the case.
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