Costa Rican President Oscar Arias has called the rival factions in Honduras to a new round of talks on Saturday to try to end the political crisis there.
Mr Arias, who is the chief mediator, also said that the Honduran factions should be "patient".
He was speaking after ousted Honduran President Manuel Zelaya issued an "ultimatum" to the interim government which replaced him two weeks ago.
But Mr Arias said: "It is not easy to get results in 24 hours."
The Costan Rican leader, a Nobel peace prize laureate, said: "My experience tells me that one has to be a little patient."
Earlier talks in Costa Rica failed to produce a breakthrough.
Mr Zelaya, who was bundled out of Honduras on 28 June, is widely recognised internationally as the legitimate president of Honduras.
Warning
On Monday, at a news conference in Nicaragua, Mr Zelaya said that if the interim government in Honduras did not agree to reinstate him at the next round of negotiations, he would consider the mediation effort "a failure".
He also warned that "other measures" would be taken, but was not specific, and accused the interim government in Tegucigalpa of employing delaying tactics.
The crisis in Honduras erupted after Mr Zelaya tried to hold a non-binding public consultation on whether they supported moves to change the constitution.
This could have led to an end to a ban on presidents from seeking second terms.
The new administration led by Roberto Micheletti insists that Mr Zelaya was ousted legally. It says he will not be reinstated.
Mr Zelaya’s dramatic attempt to fly back to Honduras failed earlier this month when the military blocked the runway at Tegucigalpa airport. </p
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