diff --git a/src/main/java/cz/cvut/fel/sit/omo/foodchain/FoodChain.java b/src/main/java/cz/cvut/fel/sit/omo/foodchain/FoodChain.java
index 585f276..7da3e5d 100644
--- a/src/main/java/cz/cvut/fel/sit/omo/foodchain/FoodChain.java
+++ b/src/main/java/cz/cvut/fel/sit/omo/foodchain/FoodChain.java
@@ -1,7 +1,16 @@
 package cz.cvut.fel.sit.omo.foodchain;
 
+import cz.cvut.fel.sit.omo.foodchain.factory.FactoryManager;
+
 public class FoodChain {
+
+    private static FactoryManager factoryManager;
+
     public static void main(String[] args) {
 
     }
+
+    public static FactoryManager getFactoryManager() {
+        return factoryManager;
+    }
 }
diff --git a/src/main/java/cz/cvut/fel/sit/omo/foodchain/operation/Action.java b/src/main/java/cz/cvut/fel/sit/omo/foodchain/operation/Action.java
index 2f93457..97d989b 100644
--- a/src/main/java/cz/cvut/fel/sit/omo/foodchain/operation/Action.java
+++ b/src/main/java/cz/cvut/fel/sit/omo/foodchain/operation/Action.java
@@ -8,21 +8,28 @@ public class Action extends OperationBase {
     private final OperationBase lastOperation;
     private final Product product;
     private final ProductOperationType type;
+    private int duration;
 
-    Action(NodeBase node, Product product) {
+    Action(NodeBase node, Product product, ProductOperationType type) {
         super(node);
         this.product = product;
-        type = null;
+        this.type = type;
         lastOperation = product.getCurrentOperation();
+        duration = type.getDuration();
         product.setCurrentOperation(this);
         product.setStateToReadyForDispatch();
     }
 
-    public void endAction() {
+    private void endAction() {
         this.setTimeEnd();
         product.setStateToAvailable();
     }
 
+    public void tick() {
+        if (duration == 0) endAction();
+        else duration--;
+    }
+
     public OperationBase getLastOperation() {
         return lastOperation;
     }
diff --git a/src/main/java/cz/cvut/fel/sit/omo/foodchain/operation/ProductOperationType.java b/src/main/java/cz/cvut/fel/sit/omo/foodchain/operation/ProductOperationType.java
index 4664286..030ce8f 100644
--- a/src/main/java/cz/cvut/fel/sit/omo/foodchain/operation/ProductOperationType.java
+++ b/src/main/java/cz/cvut/fel/sit/omo/foodchain/operation/ProductOperationType.java
@@ -1,4 +1,22 @@
 package cz.cvut.fel.sit.omo.foodchain.operation;
 
 public enum ProductOperationType {
+
+    STORE_MEAT(10, -8);
+
+    private final int duration;
+    private final int temperature;
+
+    ProductOperationType(int duration, int temperature) {
+        this.duration = duration;
+        this.temperature = temperature;
+    }
+
+    public int getDuration() {
+        return duration;
+    }
+
+    public int getTemperature() {
+        return temperature;
+    }
 }
diff --git a/src/main/java/cz/cvut/fel/sit/omo/foodchain/requirement/Requirement.java b/src/main/java/cz/cvut/fel/sit/omo/foodchain/requirement/Requirement.java
index 7446f9c..b750380 100644
--- a/src/main/java/cz/cvut/fel/sit/omo/foodchain/requirement/Requirement.java
+++ b/src/main/java/cz/cvut/fel/sit/omo/foodchain/requirement/Requirement.java
@@ -1,4 +1,40 @@
 package cz.cvut.fel.sit.omo.foodchain.requirement;
 
+import cz.cvut.fel.sit.omo.foodchain.node.NodeBase;
+import cz.cvut.fel.sit.omo.foodchain.operation.TransactionType;
+import cz.cvut.fel.sit.omo.foodchain.product.ProductType;
+
 public class Requirement {
+
+    private final NodeBase creator;
+    private final TransactionType transactionType;
+    private final ProductType productType;
+    private int TTL;
+
+    public Requirement(NodeBase creator, TransactionType transactionType, ProductType productType) {
+        this.creator = creator;
+        this.transactionType = transactionType;
+        this.productType = productType;
+        TTL = 2;
+    }
+
+    public void tick() {
+        TTL--;
+    }
+
+    public NodeBase getCreator() {
+        return creator;
+    }
+
+    public TransactionType getTransactionType() {
+        return transactionType;
+    }
+
+    public ProductType getProductType() {
+        return productType;
+    }
+
+    public int getTTL() {
+        return TTL;
+    }
 }
diff --git a/src/main/java/cz/cvut/fel/sit/omo/foodchain/util/Ticker.java b/src/main/java/cz/cvut/fel/sit/omo/foodchain/util/Ticker.java
new file mode 100644
index 0000000..c802507
--- /dev/null
+++ b/src/main/java/cz/cvut/fel/sit/omo/foodchain/util/Ticker.java
@@ -0,0 +1,26 @@
+package cz.cvut.fel.sit.omo.foodchain.util;
+
+import cz.cvut.fel.sit.omo.foodchain.FoodChain;
+import cz.cvut.fel.sit.omo.foodchain.pool.PoolDatabase;
+
+import javax.swing.*;
+
+public class Ticker {
+
+    private static Timer timer;
+
+    public static void start() {
+        timer = new Timer(500, actionEvent -> {
+            PoolDatabase db = FoodChain.getFactoryManager().getPoolDatabaseInstance();
+            db.getChannelPoolInstance().findAll().forEach(ch -> ch.tick()); // change TTL of requirements
+            db.getNodePoolInstance().findAll().forEach(ch -> ch.tick()); // do next step in scenario
+            db.getProductPoolInstance().findAll().forEach(ch -> ch.tick()); // change duration of action
+            db.getScenarioPoolInstance().findAll().forEach(ch -> ch.tick()); // maybe unnecessary
+        });
+        timer.start();
+    }
+
+    public static void stop() {
+        timer.stop();
+    }
+}