Use this simple audio recorder or voice recorder. You can save the audio file directly to your computer or Google Drive once you finish recording your message.
Cloud Audio Recorder for Google Drive is a simple to use audio & voice recorder.
This audio recorder is a free recorder that can help you leave a voice message by using your computer microphone. 

The recorded audio message is saved as a MP3 file.
There is no time limit to the voice / audio message you wish to make.