If an internship's notice period is not stated, then it is likely that there is no formal notice period and either party can end the internship arrangement with a reasonable amount of notice. This duration is commonly understood to be 3 days.
However, if possible, it is always best to clarify this matter with your employer before starting the internship. Though if you are mid-way through and want to quit, then try to negotiate your way out to reduce your notice period.
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