Albert Barnes Commentary Acts 18:11

"And he dwelt [there] a year and six months, teaching the word of God among them." — Acts 18:11 (ASV)

And he continued. And so on. Paul was not accustomed to remain long in a place. At Ephesus, indeed, he remained three years (Acts 20:31); and his stay at Corinth was caused by his success, and by the necessity of placing a church, collected out of such corrupt and dissolute materials, on a firm foundation.