Many years!

As many of you as have been baptized into Christ, have put on Christ. Alleluia.

"It is the story of Christ, and it is the duty and joy of every Christian to know and teach this story. When children are baptized into this narrative, they become part of it. The stories of the patriarchs, the judges, the kings, the prophets, the apostles, the saints who followed them, and of Christ Himself, become their stories." - source

"Every child knows when it is loved; every child responds to affection and tenderness. An infant may not be able to articulate any of that in a rational, conscious way, but that doesn’t mean that the child has no understanding of life’s most important intimacies. And if all infants, at some level, comprehend and react to human love, surely every child can do the same with the love of the Most Holy Trinity." - source

Orthodox Baptism