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Based on the information available, it is difficult to provide an exact number of days for tolerance to develop for Ativan (lorazepam), as it can vary depending on several factors such as the individual's metabolism, the dosage, and the frequency of use. However, some resources suggest that tolerance to benzodiazepines like Ativan can develop within a few weeks [1].

Tolerance is a state where the body adapts to the drug, requiring higher doses to achieve the same effect. It's important to note that the development of tolerance can lead to increased risks of side effects and dependence [2].

The development of tolerance is a complex process and can be influenced by various factors. For instance, a study published in the Journal of Clinical Psychopharmacology found that tolerance to the hypnotic effects of benzodiazepines can develop within 2-3 weeks of regular use [3].

In conclusion, while it's challenging to provide an exact number of days for tolerance to develop for Ativan, it's generally agreed that tolerance can develop within a few weeks of regular use. It's crucial to use prescription medications, including Ativan, under the supervision of a healthcare provider to minimize the risks associated with tolerance and dependence.

Sources:
[1] "Benzodiazepine" - Wikipedia, <https://en.wikipedia.org/wiki/Benzodiazepine#Tolerance_and_dependence>
[2] "Lorazepam (Oral Route) Side Effects" - Mayo Clinic, <https://www.mayoclinic.org/drugs-supplements/lorazepam-oral-route/side-effects/drg-20063036>
[3] "Development of tolerance to the hypnotic effects of benzodiazepines" - Journal of Clinical Psychopharmacology, <https://journals.lww.com/psychopharmacology/Abstract/1985/09000/Development_of_Tolerance_to_the_Hypnotic_Effects.13.aspx>
[4] "Lorazepam" - DrugPatentWatch.com, <https://www.drugpatentwatch.com/drugs/lorazepam>