1 minute: my most important lesson from Acts: praying for the coming of the Spirit. 1-minute lecture by Acts scholar Craig Keener. (See Luke 11:13; Acts 1:14; 4:31.)
For 23 free lectures on Acts, see http://faculty.gordon.edu/hu/bi/ted_hildebrandt/DigitalCourses/00_DigitalBiblicalStudiesCourses.html#Acts_Keener