diff --git a/app/src/main/java/de/sebse/fuplanner/services/kvv/sync/BBLogin.java b/app/src/main/java/de/sebse/fuplanner/services/kvv/sync/BBLogin.java
index 527534c..42fbc25 100644
--- a/app/src/main/java/de/sebse/fuplanner/services/kvv/sync/BBLogin.java
+++ b/app/src/main/java/de/sebse/fuplanner/services/kvv/sync/BBLogin.java
@@ -18,6 +18,9 @@ import de.sebse.fuplanner.tools.network.NetworkErrorCallback;
 
 public class BBLogin extends HTTPService {
     private final FULogin mFULogin;
+    private long lastHash;
+    private long lastSync;
+    private static final long MAX_CACHE_TIME = 1000 * 60; // 1 minute
 
     public BBLogin(Context context, FULogin fuLogin) {
         super(context);
@@ -25,6 +28,10 @@ public class BBLogin extends HTTPService {
     }
 
     public void testLoginToken(@NotNull LoginTokenBB token, @NotNull NetworkCallback<LoginTokenBB> callback, @NotNull NetworkErrorCallback errorCallback) {
+        if (token.hashCode() == lastHash && lastSync + MAX_CACHE_TIME > System.currentTimeMillis() && token.getStudentId() != null) {
+            callback.onResponse(token);
+            return;
+        }
         get(String.format("https://lms.fu-berlin.de/learn/api/public/v1/users/?userName=%s", token.getUsername()), token.getCookies(), response -> {
             String body = response.getParsed();
             if (body == null) {
@@ -37,6 +44,8 @@ public class BBLogin extends HTTPService {
                 String id = json.getString("id");
                 String studentId = json.getString("studentId");
                 token.setAdditionals(id, studentId);
+                lastSync = System.currentTimeMillis();
+                lastHash = token.hashCode();
                 callback.onResponse(token);
             } catch (JSONException e) {
                 errorCallback.onError(new NetworkError(100271, 403, "Cannot parse profile!"));
diff --git a/app/src/main/java/de/sebse/fuplanner/services/kvv/sync/KVVLogin.java b/app/src/main/java/de/sebse/fuplanner/services/kvv/sync/KVVLogin.java
index 0c22888..b91676e 100644
--- a/app/src/main/java/de/sebse/fuplanner/services/kvv/sync/KVVLogin.java
+++ b/app/src/main/java/de/sebse/fuplanner/services/kvv/sync/KVVLogin.java
@@ -18,6 +18,9 @@ import de.sebse.fuplanner.tools.network.NetworkErrorCallback;
 
 public class KVVLogin extends HTTPService {
     private final FULogin mFULogin;
+    private long lastHash;
+    private long lastSync;
+    private static final long MAX_CACHE_TIME = 1000 * 60; // 1 minute
 
     public KVVLogin(Context context, FULogin fuLogin) {
         super(context);
@@ -26,6 +29,10 @@ public class KVVLogin extends HTTPService {
 
 
     public void testLoginToken(@NotNull LoginTokenKVV token, @NotNull NetworkCallback<LoginTokenKVV> callback, @NotNull NetworkErrorCallback errorCallback) {
+        if (token.hashCode() == lastHash && lastSync + MAX_CACHE_TIME > System.currentTimeMillis() && token.getFullName() != null) {
+            callback.onResponse(token);
+            return;
+        }
         get(String.format("https://kvv.imp.fu-berlin.de/direct/profile/%s.json", token.getUsername()), token.getCookies(), response -> {
             String body = response.getParsed();
             if (body == null) {
@@ -37,6 +44,8 @@ public class KVVLogin extends HTTPService {
                 String displayName = json.getString("displayName");
                 String email = json.getString("email");
                 token.setAdditionals(displayName, email);
+                lastSync = System.currentTimeMillis();
+                lastHash = token.hashCode();
                 callback.onResponse(token);
             } catch (JSONException e) {
                 errorCallback.onError(new NetworkError(100171, 403, "Cannot parse profile!"));
diff --git a/app/src/main/java/de/sebse/fuplanner/services/kvv/types/LoginTokenBB.java b/app/src/main/java/de/sebse/fuplanner/services/kvv/types/LoginTokenBB.java
index 5192d2d..a3d8ebf 100644
--- a/app/src/main/java/de/sebse/fuplanner/services/kvv/types/LoginTokenBB.java
+++ b/app/src/main/java/de/sebse/fuplanner/services/kvv/types/LoginTokenBB.java
@@ -1,5 +1,7 @@
 package de.sebse.fuplanner.services.kvv.types;
 
+import com.google.android.gms.common.internal.Objects;
+
 import org.json.JSONException;
 import org.json.JSONObject;
 
@@ -143,6 +145,11 @@ public class LoginTokenBB {
         }
     }
 
+    @Override
+    public int hashCode() {
+        return Objects.hashCode(s_session_id, session_id, username, id, studentId);
+    }
+
     public interface LoginTokenInterface {
         void run(LoginTokenBB token);
     }
diff --git a/app/src/main/java/de/sebse/fuplanner/services/kvv/types/LoginTokenKVV.java b/app/src/main/java/de/sebse/fuplanner/services/kvv/types/LoginTokenKVV.java
index e46e35c..e0acf83 100644
--- a/app/src/main/java/de/sebse/fuplanner/services/kvv/types/LoginTokenKVV.java
+++ b/app/src/main/java/de/sebse/fuplanner/services/kvv/types/LoginTokenKVV.java
@@ -1,5 +1,7 @@
 package de.sebse.fuplanner.services.kvv.types;
 
+import com.google.android.gms.common.internal.Objects;
+
 import org.json.JSONException;
 import org.json.JSONObject;
 
@@ -135,6 +137,11 @@ public class LoginTokenKVV {
         }
     }
 
+    @Override
+    public int hashCode() {
+        return Objects.hashCode(username, JSESSIONID, fullName, email);
+    }
+
     public interface LoginTokenInterface {
         void run(LoginTokenKVV token);
     }