Baptism is the Sacrament of entering the Church by uniting the faith of the one who is about to be baptized and the grace of the Holy Spirit, which mysteriously descends during prayers said by a serving priest or bishop.
During baptism, a person, as it were, dies to sinful life and is born to eternal life.
If an infant is to be baptized, then the Church performs the Sacrament based on the faith of the godparents.
In the Orthodox Church, Baptism is performed through three times immersions of the baptized in the water while saying the words: “The servant of God (the servant of God) …[name] … is baptized in the name of the Father. Amen. And the Son. Amen. And the Holy Spirit. Amen”
In the Orthodox Church, only Orthodox Christians can be godparents:
First, a rite of becoming a catechumen is held, during which special prayers are read over those who wish to be baptized – prayers in which we forbid the evil spirits to approach those who want to be baptized. Also, during those prayers, the priest asks to grant the baptized a Guardian Angel.
Next, those who are about to be baptized voluntarily renounce Satan and all his angels, and all his pride, after which the baptized also voluntarily unite with Christ, confirming this with the appropriate words. In the case of infant baptism, the godparents renounce Satan and unite with Christ on their behalf.
In today’s practice, the Sacrament of Baptism follows the catechumenate rite immediately.
During this Sacrament the priest:
The Sacrament of Chrismation is performed over the baptized immediately after Baptism, during which the Gifts of the Holy Spirit are given through the anointing of a person by the Holy Chrism.
You should expect that the Sacrament of Baptism will continue for about an hour (more less). The length depends on both the priest and those who are being baptized, especially if the babies are baptized.