When the days of his separation are fulfilled. The original law contemplated only a vow for a certain period, longer or shorter. All the Nazirites, however, of whom we read in Scripture were lifelong Nazirites: Samson ( 13:5), Samuel (1 Samuel 1:11), John the Baptist (Luke 1:15).
In all these cases, however, the vow was made for them before their birth. Hegesippus (in Euseb. 2.23) tells us that James, the Lord's brother, was a Nazirite: "He did not drink wine nor strong drink, and no razor came on his head."