diff --git a/travelogues_extraction/getrecords/session.py b/travelogues_extraction/getrecords/session.py
index 5a24bd8d13a5461d3d12a280fd86fefbee95b377..73e066d944a7d2cce39e9577167ab25c3a909ff8 100644
--- a/travelogues_extraction/getrecords/session.py
+++ b/travelogues_extraction/getrecords/session.py
@@ -1,6 +1,8 @@
+import asyncio
 from dataclasses import dataclass
 import typing
 
+import httpcore
 from lxml import etree as lxmletree
 import httpx
 
@@ -16,6 +18,7 @@ class RecordRetriever:
 
     log: list
     all_ok: bool
+    sleep: float
 
     record_xpath = lxmletree.XPath(
         r'/srw:searchRetrieveResponse/srw:records/srw:record[1]/srw:recordData/marc:record[1]',
@@ -27,6 +30,7 @@ class RecordRetriever:
         self.log = []
         self.all_ok = True  # so far
         self.session = session
+        self.sleep = 0.01
 
     @dataclass
     class Record:
@@ -44,21 +48,60 @@ class RecordRetriever:
 
 
     async def get_record_from_ac_number(self, ac_number: str) -> typing.Optional[Record]:
-        # todo timeout error
-        response = await self.session.get(url=self.url, params={
-            'startRecord': 1,
-            'maximumRecords': 1,
-            'query': f'alma.local_control_field_009={ac_number}',
-            'version': '1.2',
-            'operation': 'searchRetrieve',
-            'recordSchema': 'marcxml',
-        },
-                                          timeout=5
-                                          )
+
+        try:
+            await asyncio.sleep(self.sleep)
+            response = await self.session.get(url=self.url, params={
+                'startRecord': 1,
+                'maximumRecords': 1,
+                'query': f'alma.local_control_field_009={ac_number}',
+                'version': '1.2',
+                'operation': 'searchRetrieve',
+                'recordSchema': 'marcxml',
+            }, timeout=60)
+
+        except httpx.ConnectTimeout as timeout:
+            self.log.append({
+                'error': 'time_out',
+                'message': str(timeout),
+                'ac_number': ac_number,
+            })
+            return
+
+        except Exception as error:
+            self.sleep *= 1.3
+            try:
+                await asyncio.sleep(self.sleep)
+                response = await self.session.get(url=self.url, params={
+                    'startRecord': 1,
+                    'maximumRecords': 1,
+                    'query': f'alma.local_control_field_009={ac_number}',
+                    'version': '1.2',
+                    'operation': 'searchRetrieve',
+                    'recordSchema': 'marcxml',
+                }, timeout=60)
+
+            except httpx.ConnectTimeout as timeout:
+                self.log.append({
+                    'error': 'time_out',
+                    'message': str(timeout),
+                    'ac_number': ac_number,
+                })
+                return
+            except Exception as error:
+                self.sleep *= 1.3
+                self.log.append({
+                    'error': 'time_out',
+                    'message': str(error),
+                    'ac_number': ac_number,
+                })
+                return
+
 
         sub_log = {
             'ac_number': ac_number,
             'status_code': response.status_code,
+            'url': response.url.full_path,
         }
 
         if response.status_code != 200: