I did an experiment where I lived for awhile with a sony recorder/mic on me 24/7. It was nice to be able to refer back to conversations and events when I wanted them. Biggest issue was sorting through the data-- timestamps and recorder bookmarks were OK but I really needed full text search on the audio. It would have been great to tag via `Robert, mark timestamp, end Robert`. AI seems to be required, especially when dealing with wind noise and other issues (like the mic twisting around and all of a sudden one channel is my heartbeat.)

The sony voice recorder out there easily last 24 hrs on 1 AAA battery.. dumping to mp3 on a large sd card.