hard set mine windows

src/engine/objects/Mine.java

@@ -62,6 +62,8 @@ public class Mine extends AbstractGameObject {
 
     public int liveTime;
 
+    public int liveLength = 3600;
+
     public static ArrayList<Mine> ChinaMines = new ArrayList<>();
     public static ArrayList<Mine> EuroMines = new ArrayList<>();
     public static ArrayList<Mine> AmericaMines = new ArrayList<>();
@@ -278,7 +280,7 @@ public class Mine extends AbstractGameObject {
         writer.putInt(mine.production.hash);
         writer.putInt(mine.getModifiedProductionAmount());
         writer.putInt(mine.getModifiedProductionAmount()); //TODO calculate range penalty here
-        writer.putInt(3600); //window in seconds
+        writer.putInt(mine.liveLength); //window in seconds
 
         // Errant mines are currently open.  Set time to now.
 
@@ -299,7 +301,11 @@ public class Mine extends AbstractGameObject {
             mineOpenTime = LocalDateTime.now().withHour(mine.liveTime).withMinute(0).withSecond(0).withNano(0);
 
         writer.putLocalDateTime(mineOpenTime);
+        if(mine.liveLength == 3600) {
             writer.putLocalDateTime(mineOpenTime.plusHours(1));
+        } else{
+            writer.putLocalDateTime(mineOpenTime.plusMinutes(30));
+        }
         writer.put(mine.isActive ? (byte) 0x01 : (byte) 0x00);
 
         Building mineTower = BuildingManager.getBuilding(mine.buildingID);