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Duration of action means that the action of that particular medsicine last for that days.for example the action of arsenic remains for 60-90 days.but remember this is not a rule.this is only an observation of someone.it does not mean that u give just a dose of arsenic and need not to repeat for 60-90 days.the repetion always depends upon the condition of the patient.it does not mean that u give a patient ars for fever only one dose and need not to repeat again.no it is not true,the law is repeat the medicine till cure and this repetition depends entirely upon the condition.in acute condition frequent repetion is required.in chronic diseases where no danger to life the high potency is repeated at long intervals say 7 days-15 days and so on.i hope u understand what i mean.if there is any further question u want to ask.welcome.