diff --git a/id.saladeaula.digital/app/oauth2.py b/id.saladeaula.digital/app/oauth2.py
index 0f20af1..a425593 100644
--- a/id.saladeaula.digital/app/oauth2.py
+++ b/id.saladeaula.digital/app/oauth2.py
@@ -38,6 +38,12 @@ private_key = read_file_path('private.pem')
 private_jwk = JsonWebKey.import_key(private_key)
 
 
+GRANT_TYPES_EXPIRES_IN = {
+    'authorization_code': 60 * 3,  # 3 minutes
+    'refresh_token': 3600,  # 1 hour
+}
+
+
 class OpenIDCode(OpenIDCode_):
     def exists_nonce(self, nonce: str, request: OAuth2Request) -> bool:
         if not request.payload:
@@ -54,7 +60,7 @@ class OpenIDCode(OpenIDCode_):
             'key': private_key,
             'alg': 'RS256',
             'iss': ISSUER,
-            'exp': 3600,
+            'exp': 3600,  # 1 hour
         }
 
     def generate_user_info(self, user: User, scope: str) -> UserInfo:
@@ -308,12 +314,6 @@ class IssuerParameter(rfc9207.IssuerParameter):
         return ISSUER
 
 
-GRANT_TYPES_EXPIRES_IN = {
-    'authorization_code': 60 * 3,  # 3 minutes
-    'refresh_token': 60 * 30,  # 30 minutes
-}
-
-
 def expires_in(client, grant_type: str) -> int:
     return GRANT_TYPES_EXPIRES_IN.get(
         grant_type, BearerTokenGenerator.DEFAULT_EXPIRES_IN