The amount of time varies depending on how much music you want to transfer. Using its FireWire connection, iPod can transfer a full 10GB of music from your Mac in less than 20 minutes-that's less than 10 seconds per CD! This is over 30 times faster than transferring music with the standard USB connection on most MP3 players. Best of all, FireWire charges your iPod battery whenever it's connected to your Mac. So while you're downloading your music collection, iPod is automatically charging-without requiring extra cables or adapters.