diff --git a/check_times.py b/check_times.py
new file mode 100644
index 0000000..c365c4f
--- /dev/null
+++ b/check_times.py
@@ -0,0 +1,91 @@
+"""Check the frequency of the rebuild loop.
+
+This must be run in a directory that has the ``docsbuild.log.*`` files.
+For example:
+
+.. code-block:: bash
+
+   $ cd docsbuild-logs
+   $ scp "adam@docs.nyc1.psf.io:/var/log/docsbuild/docsbuild.log*" .
+   $ python ../check_times.py
+"""
+
+import datetime as dt
+import gzip
+from pathlib import Path
+
+
+def get_lines() -> list[str]:
+    lines = []
+    zipped_logs = list(Path.cwd().glob("docsbuild.log.*.gz"))
+    zipped_logs.sort(key=lambda p: int(p.name.split('.')[-2]), reverse=True)
+    for logfile in zipped_logs:
+        with gzip.open(logfile, "rt", encoding="utf-8") as f:
+            lines += f.readlines()
+    with open("docsbuild.log", encoding="utf-8") as f:
+            lines += f.readlines()
+    return lines
+
+
+def calc_time(lines: list[str]) -> None:
+    start = end = language = version = start_timestamp = None
+    reason = lang_ver = ''
+
+    print("Start                | Version | Language | Build          | Reason")
+    print(":--                  | :--:    | :--:     | --:            | :--:")
+
+    for line in lines:
+        line = line.strip()
+
+        if ': Should rebuild: ' in line:
+            if 'no previous state found' in line:
+                reason = 'brand new'
+            elif 'new translations' in line:
+                reason = 'translation'
+            elif 'Doc/ has changed' in line:
+                reason = 'docs'
+            else:
+                reason = ''
+            lang_ver = line.split(" ")[3].removesuffix(":")
+
+        if line.endswith("Build start."):
+            timestamp = line[:23].replace(",", ".")
+            language, version = line.split(" ")[3].removesuffix(":").split("/")
+            start = dt.datetime.strptime(timestamp, "%Y-%m-%d %H:%M:%S.%f")
+            start_timestamp = f"{line[:16]} GMT"
+
+        if start and ": Build done " in line:
+            timestamp = line[:23].replace(",", ".")
+            language, version = line.split(" ")[3].removesuffix(":").split("/")
+            end = dt.datetime.strptime(timestamp, "%Y-%m-%d %H:%M:%S.%f")
+
+        if start and end:
+            duration = (end - start).total_seconds()
+            fmt_duration = format_seconds(duration)
+            if lang_ver != f'{language}/{version}':
+                reason = ''
+            if True or language == "en":
+                print(f"{start_timestamp: <20} | {version: <7} | {language: <8} | {fmt_duration :<14} | {reason}")
+            start = end = start_timestamp = None
+
+        if ': Full build done' in line:
+            timestamp = f"{line[:16]} GMT"
+            _, fmt_duration = line.removesuffix(").").split("(")
+            print(f"{timestamp: <20} | --FULL- | -BUILD-- | {fmt_duration :<14} | -----------")
+
+    if start and end is None:
+        if True or language == "en":
+            print(f"{start_timestamp: <20} | {version: <7} | {language: <8} | In progress... | {reason}")
+
+
+def format_seconds(seconds: float) -> str:
+    hours, minutes = divmod(seconds, 3600)
+    minutes, _ = divmod(minutes, 60)
+    hours, minutes = int(hours), int(minutes)
+    if hours == 0:
+        return f"{minutes}m"
+    return f"{hours}h {minutes}m"
+
+
+if __name__ == "__main__":
+    calc_time(get_lines())