The Collaborative International Dictionary of English v.0.48:

face time \face" time`\ (f[=a]s" t[imac]m`), n.
   Time spent speaking with a person face-to-face; -- contrasted
   with time spent communicating by electronic media, such as
   telephone or e-mail, or via written communications; as, the
   chief of staff has the most face time with the president.
   [Recent]
   [PJC]

WordNet (r) 3.0 (2006):

face time
    n 1: work time spent at the location of or in the presence of
         other people; "instead of working on the problem at home he
         devoted face time to it at the office"

The Jargon File (version 4.4.7, 29 Dec 2003):

face time
 n.

    [common] Time spent interacting with somebody face-to-face (as opposed to
    via electronic links). ?Oh, yeah, I spent some face time with him at the
    last Usenix.?


The Free On-line Dictionary of Computing (30 December 2018):

face time

    Time spent interacting with somebody face-to-face (as
   opposed to via electronic links).  "Oh, yeah, I spent some
   face time with him at the last Usenix."

   [Jargon File]