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How long does a write to pstorage take?

I want to store sensor measurements taken every 2.5ms persistently. Does a write to the internal flash happen faster than this? Can I safely assume that the internal flash write will not alter the flow of my program execution (e.g. stop the 2.5ms timer while it is being written)?

Documentation on the pstorage module does not seem to reference any kind of general timing.

developer.nordicsemi.com/.../a00781.html

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