For me, once they get past 1/8 of an inch (0.32 cm) long, I feel like The Wolverine.
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When my nails hit my keyboard before my fingertips do
I would never think to let my nails grow so long.
I cut them once a week when they have noticeable white boarder and slightly longer than my finger.
But I use my finger nails in my work a lot so I need to actually get surface with them.