FIX: setting tl3_min_likes_received too high can make it impossible to be promoted to tl3. Cap the min number of days over which those likes must be received.

app/models/trust_level3_requirements.rb

@@ -174,7 +174,9 @@ class TrustLevel3Requirements
   end
 
   def min_likes_received_days
-    (min_likes_received.to_f / 3.0).ceil
+    # Since min_likes_received / 3 can be greater than the number of days in time_period,
+    # cap this result to be less than time_period.
+    [(min_likes_received.to_f / 3.0).ceil, (0.75 * time_period.to_f).ceil].min
   end
 
   def num_likes_received_users

spec/models/trust_level3_requirements_spec.rb

@@ -67,6 +67,20 @@ describe TrustLevel3Requirements do
       expect(tl3_requirements.min_likes_received_days).to eq(7)
       expect(tl3_requirements.min_likes_received_users).to eq(5)
     end
+
+    it "min_likes_received_days is capped" do
+      SiteSetting.tl3_requires_likes_received = 600
+      expect(tl3_requirements.min_likes_received).to eq(600)
+      expect(tl3_requirements.min_likes_received_days).to eq(75) # 0.75 * tl3_time_period
+    end
+
+    it "min_likes_received_days works when time_period is 1" do
+      SiteSetting.tl3_requires_likes_received = 20
+      SiteSetting.tl3_time_period = 1
+      expect(tl3_requirements.min_likes_received).to eq(20)
+      expect(tl3_requirements.min_likes_received_days).to eq(1)
+      expect(tl3_requirements.min_likes_received_users).to eq(5)
+    end
   end
 
   describe "days_visited" do