Nazir 7: Until the End of the World

3 mishnayot on vowing to become a nazir. First, how to specify the term of nezirut, and how the default remains 30 days. Plus, measuring distance between places based on how long it takes to travel there. Also, the language used itself can make the difference, including when not to default to 30 days, but that doesn't mean adding on an hour or a day in your vow necessarily works.