Ms Yingluck’s six-party ruling coalition holds about three-fifths of the seats in the lower house.
The opposition earlier lodged a no-confidence motion against Prime Minister Yingluck Shinawatra, her deputy Chalerm Yubumrung, Defence Minister Sukumpol Suwanatat and Deputy Interior Minister Chat Kuldilok, also former deputy transport minister, for mismanagement leading to corruption.
Out of the whole 45 hours, the opposition has been given 30 hours to cross-examine the prime minister and three cabinet members, while the premier and the three ministers have altogether twelve hours to defend themselves. Three hours is set aside for possible lawmakers' protests during the debate.
Signed by 155 Democrats and two Rak Prathet Thai Party MPs, the motion calls for the premier to be questioned for mismanagement and for her failure to deliver results in accord with her policy statement earlier pledged to parliament.