The opposition candidate for Prime Minister of Hungary (held on 3 April 2022) was Péter Márki-Zay. He stated that opposition politicians are entitled to only five minutes of airtime on Hungarian public television. Via an interview with Márki-Zay, Meet the conservative who could unseat Viktor Orbán, published 14 January 2022 on website openDemocracy:
“Opposition politicians cannot get any airtime on public television
paid for by our taxpayers’ money,” Márki-Zay says. “In the four-year
cycle, an entire opposition party can only get five minutes airtime on
This was confirmed by Euronews on 29 March 2022, Claims of media bias...:
When Hungarian state TV was obliged by electoral law to give airtime
to opposition candidate Péter Márki-Zay - it ran an interview early in
the morning that lasted just five minutes.
In the following passage from the same openDemocracy article, note the reference to televised debates ahead of the opposition primary to select the prime ministerial candidate:
...the international press anointed Budapest mayor Gergely Karácsony in
the autumn, dark horse Péter Márki-Zay was making a splash in
televised debates ahead of an unprecedented opposition primary to
select its prime ministerial candidate. Karácsony, a political
pollster by trade, saw the writing on the wall. Stepping aside, he
cleared the way for a Márki-Zay victory...
If televised debates are allowed, then television broadcasts featuring opposition candidates are clearly possible, although the premise of the question remains correct: Air time on Hungarian PUBLIC television MDTV is limited to five minutes for the opposition parties. See too: After Four Years of Neglect, State Media Gives Five Minutes to Each Opposition Party before Election via Hungary Today in English (and in German).
Drawing from Hungarian and non-Hungarian sources, the answer is yes, the opposition candidate for prime minister in 2022 only received five minutes of public television airtime.