Acts 18:11
So he settled there for a year and six months, teaching them the word of God [concerning eternal salvation through faith in Christ].
Acts 14:3
So Paul and Barnabas stayed for a long time, speaking boldly and confidently for the Lord, who continued to testify to the word of His grace, granting that signs and wonders (attesting miracles) be done by them.
Acts 19:10
This continued for two years, so that all the inhabitants of [the west coast province of] Asia [Minor], Jews as well as Greeks, heard the word of the Lord [concerning eternal salvation through faith in Christ].
Acts 20:31
Therefore be continually alert, remembering that for three years, night or day, I did not stop admonishing and advising each one [of you] with tears.