Any differences between session time (s_core_sessions) and cookie lifetime?
You can check the session lifetime on the server in the database (s_core_sessions) with the session id from the cookie.
The cookie expiry in the table is 1538510232 and modified is 1538508792.
Chrome reports the cookie as
Created: Tuesday, October 2, 2018 at 9:33:11 PM (but I’ve had these items in the basket for much longer.
‚Expires: When the browsing session ends‘. (but that doesn’t seem to be the case).