At Cambridge University, six terms of Teaching, Examining and Administrative labour normally entitles you to one term of sabbatical leave, in order to recharge your intellectual batteries; and you can't accumulate more than three terms' leave without losing entitlement.  As a 'University Teaching Officer' from April 1961 to December 1976 and from 1980 to 2002, I took sabbatical leave whenever possible, and held visiting appointments at other Universities as follows (I include also two shorter visits during University vacations to Russia and China at moments that may now be seen as historical watersheds):

Stanford, Calif., March - July 1965, and Johns Hopkins, Baltimore, Md., Sept. - Dec. 1965

Université Pierre et Marie Curie  (Paris VI), Academic year 1975/6

Royal Society/USSR Academy of Sciences exchange visit to USSR, March/April 1982

University of Palermo, Sicily, January 1984

China, at the invitation of Academica Sinica, September 1986

Institut Nationale Polytechnique de Grenoble, France, Sept. 1986-March 1987

UCSD, San Diego, Calif., April - July 1987

RIMS, Kyoto, Japan, Jan.-April 1993

Ecole Polytechnique, Palaiseau, France, May-July 1994

Ecole Normale Supérieure, Paris, Sept. 2001- March 2002


These periods abroad were wonderfully stimulating -- see the following subpages:


Ecole Normale Supérieure, Paris 2001/2    Ecole Polytechnique, 1994, 1995 Grenoble 1986/7   Palermo 1984   Paris VI 1975/6 RIMS, Kyoto, 1993   Russia 1982   Stanford and Johns Hopkins 1965   UCSD 1987