Acts 18:11
"And he continued there a year and six months, teaching the word of God among them."
Cross References (ranked by relevance)
Acts 14:3
Long time therefore abode they speaking boldly in the Lord, which gave testimony unto the word of his grace, and granted signs and wonders to be done by their hands.
Acts 19:10
And this continued by the space of two years; so that all they which dwelt in Asia heard the word of the Lord Jesus, both Jews and Greeks.
Acts 20:31
Therefore watch, and remember, that by the space of three years I ceased not to warn every one night and day with tears.