Depends on the friend. With some, our relationship has dwindled to just, "Cute! Congrats to Jillian!" on a FB post about their child's accomplishment. With others, if we go a week without talking one will text "I miss your face" and we'll catch up.
I have a standing laundry FaceTime date with one friend - we FT while folding laundry one evening a week for an hour or so.