Most undertook such vows for only a set period of time, but a few, such as Samson, Samuel, and John the Baptist, were lifelong Nazirites.
Kebanyakan orang Nazir menjalani ikrar demikian hanya untuk suatu waktu, tetapi beberapa orang, seperti Simson, Samuel, dan Yohanes Pembaptis, adalah orang Nazir seumur hidup.