I’m using GarageBand to make a podcast. The recording is 90 minutes long. When I imported it into GarageBand to podcast-ize, I noticed that GarageBand stopped allowing me to play past 1:06:00. GarageBand apparently has a limited number of beats that it can support in a song – so, if you want to make a longer track, you have to change the tempo for the piece to something less than the default of 120. You can do that with a slider that appears when you click on the tempo control, which appears in the counter.