For me, Neumann's and Ancerl's tenure are"some time"
* 1950-1968 Karel Ančerl
* 1968-1989 Václav Neumann
* 1990-1992 Jiří Bělohlávek
* 1993-1996 Gerd Albrecht
* 1996-2003 Vladimir Ashkenazy
* 2003-2007 Zdeněk Mácal
but other's interpretation may vary. How long is a typical director's contract for lately, anyway? It looks like the Czech Phil has had a few "one and out" directors since Neumann.