diff --git a/v6d2ctx/pain.py b/v6d2ctx/pain.py
index c14071a..6e1f517 100644
--- a/v6d2ctx/pain.py
+++ b/v6d2ctx/pain.py
@@ -55,19 +55,24 @@ class ABlockMonitor:
     __task: asyncio.Future
     __max: float
 
-    def __init__(self, threshold=0.0) -> None:
+    def __init__(self, *, threshold=0.0, delta=10.0, interval=0.0) -> None:
         self.__max = threshold
+        self.delta = delta
+        self.interval = interval
 
     async def _monitor(self):
         while True:
-            delta = 10
+            delta = self.delta
             t = time.time()
             await asyncio.sleep(delta)
             spent = time.time() - t
             delay = spent - delta
             if delay > self.__max:
                 self.__max = delay
-                print(f'block monitor reached new peak delay {delay:.3f}')
+                print(f'block monitor reached new peak delay {delay:.4f}')
+            interval = self.interval
+            if interval > 0:
+                await asyncio.sleep(interval)
 
     async def __aenter__(self):
         self.__task = asyncio.get_running_loop().create_task(self._monitor())