If the debate ends on time, its duration will be about 25 hours, but if extended into early Thursday, it could last 30 hours, he said, adding that the decision was final.
However, Democrat leader Abhisit Vejjajiva said the appropriate duration should be three days, starting from Monday.
Then the vote on the censure and impeachment could take place on Thursday, which is the last day of the current House session.
Yingluck has postponed a planned Singapore trip from next week to January, Government Spokesman Teerat Ratanasevi said.
She had been scheduled to visit the city-state for the Thai-Singapore Prime Ministers’ Retreat on Tuesday and Wednesday.
But the Cabinet retreat in Songkhla will still be held as scheduled on November 29 and 30, Teerat said.