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albert
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idk if its open source or if you can reuse it, so possibly not helpful but:
http://coffitivity.com/

also https://www.freesound.org

EDIT: EDIT 2:
coffitivity is a no go, but freesound has cafe background noise(s),nature sounds offers kitchen audio...which may not sure which you prefer, but this five minute long one looks like a winner:be close enough. it allows for exporting 30min file
http://www.freesound.org/people/4team/sounds/214993/http://naturesoundsfor.me/

ok. i can't find anything longer than a few minutes. check out some of the results in the open audio community on archive.org:
https://archive.org/details/opensource_audio

idk if its open source or if you can reuse it, so possibly not helpful but:
http://coffitivity.com/

also https://www.freesound.org

EDIT: EDIT 2:
coffitivity is a no go, but freesound has cafe background noise(s), not sure which you prefer, but this five minute long one looks like a winner:
http://www.freesound.org/people/4team/sounds/214993/

ok. i can't find anything longer than a few minutes. check out some of the results in the open audio community on archive.org:
https://archive.org/details/opensource_audio

nature sounds offers kitchen audio...which may not be close enough. it allows for exporting 30min file
http://naturesoundsfor.me/

ok. i can't find anything longer than a few minutes. check out some of the results in the open audio community on archive.org:
https://archive.org/details/opensource_audio

added 195 characters in body
Source Link
albert
  • 11.9k
  • 4
  • 31
  • 58

idk if its open source or if you can reuse it, so possibly not helpful but:
http://coffitivity.com/

also https://www.freesound.org

EDIT: EDIT 2:
coffitivity is a no go, but freesound has cafe background noise(s), not sure which you prefer, but this five hourminute long one looks like a winner:
http://www.freesound.org/people/4team/sounds/214993/

ok. i can't find anything longer than a few minutes. check out some of the results in the open audio community on archive.org:
https://archive.org/details/opensource_audio

idk if its open source or if you can reuse it, so possibly not helpful but:
http://coffitivity.com/

also https://www.freesound.org

EDIT:
coffitivity is a no go, but freesound has cafe background noise(s), not sure which you prefer, but this five hour long one looks like a winner:
http://www.freesound.org/people/4team/sounds/214993/

idk if its open source or if you can reuse it, so possibly not helpful but:
http://coffitivity.com/

also https://www.freesound.org

EDIT: EDIT 2:
coffitivity is a no go, but freesound has cafe background noise(s), not sure which you prefer, but this five minute long one looks like a winner:
http://www.freesound.org/people/4team/sounds/214993/

ok. i can't find anything longer than a few minutes. check out some of the results in the open audio community on archive.org:
https://archive.org/details/opensource_audio

corrected first answer, took second answer more in-depth
Source Link
albert
  • 11.9k
  • 4
  • 31
  • 58

idk if its open source or if you can reuse it, so possibly not helpful but:
http://coffitivity.com/

also https://www.freesound.org

EDIT:
coffitivity is a no go, but freesound has cafe background noise(s), not sure which you prefer, but this five hour long one looks like a winner:
http://www.freesound.org/people/4team/sounds/214993/

idk if its open source or if you can reuse it, so possibly not helpful but:
http://coffitivity.com/

also https://www.freesound.org

idk if its open source or if you can reuse it, so possibly not helpful but:
http://coffitivity.com/

also https://www.freesound.org

EDIT:
coffitivity is a no go, but freesound has cafe background noise(s), not sure which you prefer, but this five hour long one looks like a winner:
http://www.freesound.org/people/4team/sounds/214993/

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Source Link
albert
  • 11.9k
  • 4
  • 31
  • 58
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