It's hard to say. Perhaps when Jesus asked him to follow Him and he did?

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Yes, we agree experiencing conversion and rebirth in God's appointed way does not mean they are incapable of neglecting Jesus and resuming where they left off sinning. We are not free to sin until we are free from sin. Rebirth sets us free. We are born again dead to sin and awake to righteousness. Walking in the mind of the new man allows Jesus to empower us to abide in Him, to partake of the divine nature, and thereby to grow in grace and mature daily in the fruits of the Spirit. The growth we enjoy while abiding in Jesus, while partaking of the divine nature progresses from grace to grace, from faith to faith, from glory to glory - not from greater sins to lesser sins. Like Jesus, who grew and matured from childhood to manhood, so too, we grow and mature shinning more and more unto the perfect day, from candlelight to sunlight. This glorious growth begins at rebirth here on Earth and will continue throughout Eternity. Thank you, Jesus.

I think Peter's conversion took place after he denied Christ, heard the rooster crow, and saw the look in Christ's eyes. That is when Peter ran away in tears of true repentance and conversion.

So then, have you cried your heart out already; or are you waiting for an opportune time to first deny Christ?

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I agree.
Prior to that time, he respected and loved the Lord, but he still depended upon himself. It's when a person realizes there total NEED for the Savior and recognize His forgiving, powerful love, that real conversion occurs.

SDA born in an SDA home are never converted to being SDA. When they decide to be baptized, their baptism is not evidence of conversion. An ottoman is never converted into use as an ottoman, but when a book is placed on it and a chair is brought to its side, then it is said to have been converted into a desk. In a similar manner, when a Roman Catholic is baptized by an SDA pastor, that baptism is confirmation of his conversion from one denomination to the next.

When the disciples heeded the call of Jesus to follow Him, they were converted from Judaism to Christianity. As Peter would tell Jesus, "See, we have left all and followed You. Therefore what shall we have?" to which Jesus responded, "And everyone who has left houses or brothers or sisters or father or mother or wife or children or lands, for My name's sake, shall receive a hundredfold, and inherit eternal life." Mat. 19:23-30

Conversion is a simple assent to a new way of life. Like in marriage, baptism (aka the wedding) is ALWAYS done in sincere hope!

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A person is converted to Jesus when they learn how to live in harmony with "all things whatsoever" He commanded. Conversion is a process and a product.

Good point. People who are raised in Christian homes must make a commitment to continue living in harmony with "all things whatsoever" Jesus commanded (assuming they actually learned it). Converting from one set of values and lifestyles to the ones Jesus commands in the Bible is a process that hopefully ends in rebirth and baptism and joining a Church family and using their newly acquired gifts and talents to help build up the body of Christ and to inspire the world around them to love Jesus and live for Him.

How far are you along this road? And why it is taking you so long to arrive at the point of sinless perfection?

The beauty of Jesus' promises are wonderful and amazing, namely, I am as perfect as my Heavenly Father while I am abiding in Jesus, partaking of the divine nature, growing in grace, maturing daily in the fruit of the Spirit. It is a reality here and now - not at some future time and place.