How long is too long to be in a relationship before getting married?

I feel and believe marriage is one of God's greatest blessings. The bible speaks “He who finds a wife finds a good thing and receives favor from the Lord”

I've seen relationship where both parties held a love for God and each other on the same level walk in unforeseen blessings like never before.

If both parties love each other, witness growth in dating, and push each other to walk into their destiny what’s the purpose in waiting countless years to receive the blessing of a “good thing”.