So I did a little more work and found the answer to my question and post it here just so that anyone else who needs the info has it. I had assumed that when uploading a CD, you had to do it all at once, no interruptions. As it turns out, you can leave the CD in the drive and turn the car on and off as many times as you like. The unit will upload as much as it can whenever it has power. So today, my only driving was some local errands and that allowed me to load approx 1-1/2 disks. Good enough for me.