Valmiki Ramayana Aranya Kanda Sarga 30 Shloka 35

रामेण by Rama, अर्धाधिकमुहूर्तेन little more than half a moment (a moment i.e. मुहूर्त is 48 seconds) निशितैः sharp, शरैः darts, महाहवे in the great war, भीमकर्मणाम् of terrific tasks, खरदूषणमुख्यानाम् led by Khara and Dusana, रक्षसाम् demons, चतुर्दश fourteen, सहस्राणि thousand, निहतानि were killed.

'In a little more than half a moment of this great war Rama had accomplished the terrific task of killing with sharp darts fourteen thousand demons, led by Khara and Dusana.