Following his graduation, he worked as a Researcher at the Slovak Academy of Sciences and an engineering geologist in the Doprastav company, focusing on bridge construction.

In these activities, he cooperated with his fellow future MP László Nagy, with whom Duray co-founded the Committee for the Defense of Rights of Hungarians in Czechoslovakia.

[2] In 1990 the Hungarian Civic Party ran on the umbrella anti-communist Public Against Violence ticket and Duray gained a seat in the Federal Assembly.

In 2006 he called the Slovak National Party fascist in a radio interview, for which he was ordered apologize by a Bratislava district court.

The funeral was ecumenical – led by a Roman Catholic priest also in presence of Calvinist pastor in Lučenec Synagogue.

The funeral participants included Viktor Orbán and László Kövér representing Hungary as well as the Speaker of the National Council Boris Kollár, Deputy Speaker Gábor Grendel, former Prime Minister Ján Čarnogurský, presidential candidate Gyula Bárdos as well as other mainly ethnic-Hungarian politicians including Krisztián Forró, György Gyimesi and Pál Csáky.

Following the service, the procession moved to a local cemetery, where Duray's remains were interred accompanied to tunes of folk songs, ballads and singing.