Colombia's delegation to peace talks with FARC rebels is heading back to Cuba to resume negotiations, and its chief says it's time to accelerate the pace and get some measurable results toward ending the half-century-old conflict.

Humberto de la Calle told reporters Sunday after the team met with Colombian President Juan Manuel Santos that a "faster pace" is needed. He asked society and the leftist Revolutionary Armed Forces of Colombia for help.

The talks formally began in Havana in November and paused for a holiday break. They have been focusing on agricultural reform, the thorniest topic on a five-point agenda.

Analysts say Santos will need to show results sooner than later if he wishes to win re-election next year.

A FARC unilateral cease-fire is set to end Jan. 20.