diff --git a/crawl4ai/async_dispatcher.py b/crawl4ai/async_dispatcher.py
index 69d276fb..b587d011 100644
--- a/crawl4ai/async_dispatcher.py
+++ b/crawl4ai/async_dispatcher.py
@@ -13,7 +13,7 @@ from rich.live import Live
 from rich.table import Table
 from rich.console import Console
 from rich import box
-from datetime import timedelta
+from datetime import timedelta, datetime
 from collections.abc import AsyncGenerator
 import time
 import psutil
diff --git a/crawl4ai/extraction_strategy.py b/crawl4ai/extraction_strategy.py
index e0e49d99..3b708421 100644
--- a/crawl4ai/extraction_strategy.py
+++ b/crawl4ai/extraction_strategy.py
@@ -1064,7 +1064,7 @@ class JsonElementExtractionStrategy(ExtractionStrategy):
             api_token (str): Legacy Parameter. API token for LLM provider
             llm_config (LLMConfig): LLM configuration object
             prompt (str, optional): Custom prompt template to use
-            **kwargs: Additional args passed to perform_completion_with_backoff
+            **kwargs: Additional args passed to LLM processor
             
         Returns:
             dict: Generated schema following the JsonElementExtractionStrategy format
@@ -1130,7 +1130,8 @@ In this scenario, use your best judgment to generate the schema. Try to maximize
                 prompt_with_variables="\n\n".join([system_message["content"], user_message["content"]]),
                 json_response = True,                
                 api_token=llm_config.api_token,
-                **kwargs
+                base_url=llm_config.base_url,
+                extra_args=kwargs
             )
             
             # Extract and return schema
diff --git a/crawl4ai/models.py b/crawl4ai/models.py
index ef9efc06..c1caff94 100644
--- a/crawl4ai/models.py
+++ b/crawl4ai/models.py
@@ -37,13 +37,33 @@ class CrawlStatus(Enum):
     FAILED = "FAILED"
 
 
+# @dataclass
+# class CrawlStats:
+#     task_id: str
+#     url: str
+#     status: CrawlStatus
+#     start_time: Optional[datetime] = None
+#     end_time: Optional[datetime] = None
+#     memory_usage: float = 0.0
+#     peak_memory: float = 0.0
+#     error_message: str = ""
+
+#     @property
+#     def duration(self) -> str:
+#         if not self.start_time:
+#             return "0:00"
+#         end = self.end_time or datetime.now()
+#         duration = end - self.start_time
+#         return str(timedelta(seconds=int(duration.total_seconds())))
+
+
 @dataclass
 class CrawlStats:
     task_id: str
     url: str
     status: CrawlStatus
-    start_time: Optional[datetime] = None
-    end_time: Optional[datetime] = None
+    start_time: Optional[Union[datetime, float]] = None
+    end_time: Optional[Union[datetime, float]] = None
     memory_usage: float = 0.0
     peak_memory: float = 0.0
     error_message: str = ""
@@ -52,11 +72,21 @@ class CrawlStats:
     def duration(self) -> str:
         if not self.start_time:
             return "0:00"
+            
+        # Convert start_time to datetime if it's a float
+        start = self.start_time
+        if isinstance(start, float):
+            start = datetime.fromtimestamp(start)
+            
+        # Get end time or use current time
         end = self.end_time or datetime.now()
-        duration = end - self.start_time
+        # Convert end_time to datetime if it's a float
+        if isinstance(end, float):
+            end = datetime.fromtimestamp(end)
+            
+        duration = end - start
         return str(timedelta(seconds=int(duration.total_seconds())))
 
-
 class DisplayMode(Enum):
     DETAILED = "DETAILED"
     AGGREGATED = "AGGREGATED"