cookie lifetime does not apply to facebook

[Faxopita]

Hello,

I use this alias:

Code:

allow-all-cookies = -crunch-all-cookies -session-cookies-only -filter{content-cookies} \
                    +limit-cookie-lifetime{30}

Then, I add my preferred sites under…

Code:

{ allow-all-cookies }
  shopping_site.tld # Example of trusted website.

Cookie lifetime is set to 30 min. I confirm this setting is well reflected on the preferred websites I visit. However, occasionally, one out of a handful of cookies failed to meet that setting on some website. I don't know why.

I can't confirm on FB, since I don't use it.