diff --git a/main.py b/main.py
index b42f583..39dafef 100644
--- a/main.py
+++ b/main.py
@@ -1,3 +1,4 @@
+from datetime import datetime, timedelta
 import time
 import sys
 
@@ -12,14 +13,11 @@ def main () -> None:
 
     api.login (account.USER_ID, account.PASSWORD)
 
+    last_posted_at = datetime.now () - timedelta (hours = 6)
     while True:
-        api.send_post (Talk.main ('今Twitterに何か投稿するなら何て書く? '
-                                  '投稿する内容だけを引用符などでくくらず'
-                                  'そのまま出力して'))
-
-        time.sleep (3600)
-
-        pass
+        if datetime.now () - last_posted_at >= timedelta (hours = 6):
+            api.send_post (Talk.main (''))
+            last_posted_at = datetime.now ()
 
 
 if __name__ == '__main__':