Acts 14:3 describes Paul and Barnabas staying a long time and speaking boldly — a parallel to Paul's year-and-a-half stay in Corinth teaching the word.

Acts 19:10 notes a two-year teaching ministry in Ephesus — matching the pattern of extended ministry periods like the 18 months in Corinth.

Acts 20:31 recalls three years of nightly admonition in Ephesus — another example of Paul's long-term dedication in a city, similar to his 18 months in Corinth.