Cross reference
Acts 18:11
11 And he dwelt `there' a year and six months, teaching the word of God among them.
Acts 14:3
3 Long time therefore they tarried `there' speaking boldly in the Lord, who bare witness unto the word of his grace, granting signs and wonders to be done by their hands.
Acts 19:10
10 And this continued for the space of two years; so that all they that dwelt in Asia heard the word of the Lord, both Jews and Greeks.
Acts 20:31
31 Wherefore watch ye, remembering that by the space of three years I ceased not to admonish every one night and day with tears.