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Fortunately, there are open-end put options, so the timing doesn't have to be THAT accurate.

EDIT: to be precise: I mean open-end turbo put, which have no expiration but a knock-out.

Put options have an expiration. So I'm curious what you mean by "open-end"?

Yeah, not a thing. You can short a stock long-term, but that's an easy way to become insolvent.

Perpetual options are a thing, although not mainstream.

Options exist with no expiration date, but they are not commonly traded. There's nothing in principle unusual about them, at least not more so than most other derivatives.

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