When WAV is the right answer
WAV stores audio as raw samples with no compression. It is the correct choice when the file is an intermediate — going into an editor, a DAW, a transcription tool, or anything that will process it further — because you are not stacking another lossy generation on top of the one already inside the video.
It is the wrong choice for listening or sharing. Expect roughly 10 MB per minute for stereo at 44.1 kHz, so an hour is about 600 MB. If you only want to play the file, MP3 or M4A will be a tenth of the size and sound the same.