Actually for some long acting remedies they use the term deep-acting like e.g. causticum, it's too slow for acutes.
For acutes the remedies have to act fast (so maybe this also means briefly?)- but why for chronic diseases they would have to act long and slow? Can't they act fast though briefly-and just the dose be repeated?

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Astra<br /><br />"Difficult cases take some time to be cured,<br />impossible - a little longer."