ppf: add format_duration helper and stale log improvements

- Add format_duration() for compact time display
- Improve stale proxy logging with duration info

ppf.py

@@ -32,6 +32,23 @@ signal.signal(signal.SIGTERM, sigterm_handler)
 
 config = Config()
 
+
+def format_duration(seconds):
+    """Format seconds into compact human-readable duration."""
+    if seconds < 60:
+        return '%ds' % seconds
+    elif seconds < 3600:
+        return '%dm' % (seconds // 60)
+    elif seconds < 86400:
+        h, m = divmod(seconds, 3600)
+        m = m // 60
+        return '%dh %dm' % (h, m) if m else '%dh' % h
+    else:
+        d, rem = divmod(seconds, 86400)
+        h = rem // 3600
+        return '%dd %dh' % (d, h) if h else '%dd' % d
+
+
 def import_from_file(fn, sqlite):
     with open(fn, 'r') as f:
         urls = [ url for url in f.read().split('\n') if url ]
@@ -156,7 +173,8 @@ class Leechered(threading.Thread):
             self.hash_unchanged = True
             self.proxylist = []
             self.stale_count += 1
-            _log('%s: unchanged (hash match)' % self.url.split('/')[2], 'stale')
+            next_check = config.ppf.checktime + (self.error + self.stale_count) * config.ppf.perfail_checktime
+            _log('%s: unchanged (hash match), next in %s' % (self.url.split('/')[2], format_duration(next_check)), 'stale')
             # Content unchanged - increment stale_count, update check_time
             self.execute = (self.error, self.stale_count, int(time.time()), self.retrievals, self.proxies_added, self.content_type, self.url)
             self.status = 'ok'