Clicking the RECORD button will record the signal at the Microphone input. If you don't click the STOP button until the end of your show, you recorded the whole thing.
Be aware that this is recording at 44.100 samples/second STEREO .WAV file so it writes directly to an Audio CD. DO NOT record over about 79 minutes or you can't write the file to an 80 minute CD. Yes, you could use an audio editor and split up the .wav file if you want to. Just want to make sure you understand the limitations on doing the whole thing.
Also, make sure you have the disc space: 10.6MB/minute record time.