diff --git a/Dockerfile b/Dockerfile
index 7e40a98..e0c283c 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -17,6 +17,7 @@ COPY apolpi.py boot.sh ./
 RUN chmod +x boot.sh
 
 ENV FLASK_APP apolpi.py
+ENV TIMEOUT 30
 EXPOSE 80
 
 ENTRYPOINT ["/apolpi/boot.sh"]
diff --git a/apolpi.py b/apolpi.py
index 9da4b10..dd2e791 100644
--- a/apolpi.py
+++ b/apolpi.py
@@ -9,8 +9,10 @@
 
 global CACHED_RESULT
 global CACHED_TIME
+global TIMEOUT
 CACHED_RESULT = None
 CACHED_TIME = 0
+TIMEOUT = int(os.environ.get('TIMEOUT', 30))
 
 app = Flask(__name__)
 
@@ -113,7 +115,7 @@ def doit():
     global CACHED_TIME
     global CACHED_RESULT
     now = time.time()
-    if now - CACHED_TIME > 30:
+    if now - CACHED_TIME > TIMEOUT:
         CACHED_RESULT = _fetch()
         CACHED_TIME = now