Format this for sake of readability. Try to keep day/night spawn rations in mind, then dispersing frequencies  through out the time.

      { "monster" : "mon_cougar", "freq" : 1, "cost_multiplier" : 3                 },
      { "monster" : "mon_cougar", "freq" : 2, "cost_multiplier" : 3,                "conditions" : ["DAWN", "DUSK"] },
      { "monster" : "mon_cougar", "freq" : 1, "cost_multiplier" : 3, "ends" :   72  },
      { "monster" : "mon_cougar", "freq" : 2, "cost_multiplier" : 3, "ends" :   72, "conditions" : ["DAWN", "DUSK"] },
      { "monster" : "mon_cougar", "freq" : 1, "cost_multiplier" : 3, "ends" :  168  },
      { "monster" : "mon_cougar", "freq" : 2, "cost_multiplier" : 3, "ends" :  168, "conditions" : ["DAWN", "DUSK"] },
      { "monster" : "mon_cougar", "freq" : 1, "cost_multiplier" : 3, "ends" :  672  },
      { "monster" : "mon_cougar", "freq" : 2, "cost_multiplier" : 3, "ends" :  672, "conditions" : ["DAWN", "DUSK"] },
      { "monster" : "mon_cougar", "freq" : 1, "cost_multiplier" : 3, "ends" : 2160  },
      { "monster" : "mon_cougar", "freq" : 2, "cost_multiplier" : 3, "ends" : 2160, "conditions" : ["DAWN", "DUSK"] },