Nomination/vacancy announcement trends.....

Nominee -- Vacancy -- Vacancy Announced --
Nominee Announced

Stephen Breyer -- Blackmun -- 4/6/94 -- 5/14/94 (38 days later)
R.B. Ginsburg -- White -- 3/19/93 -- 6/14/93 (87 days later)
Clarence Thomas -- Marshall -- 6/27/91 -- 7/1/91 (4 days later)
David Souter -- Brennan -- 7/21/90 -- 7/23/90 (2 days later)
A. Kennedy -- Powell -- 6/26/87 -- 11/11/87 (138 days later)
Robert Bork -- Powell -- 6/26/87 -- 7/1/87 (5 days later)
Antonin Scalia -- Burger -- 6/17/86 -- 6/17/86 (0 days later)
Wm. Rehnquist -- Burger -- 6/17/86 -- 6/17/86 (0 days later)
Sandra O'Connor -- Stewart -- 6/18/81 -- 7/7/81 (19 days later)