diff --git a/sidecar/index.ts b/sidecar/index.ts
index 159e8a4..9456794 100644
--- a/sidecar/index.ts
+++ b/sidecar/index.ts
@@ -87,6 +87,20 @@ const server = Bun.serve({
   hostname: '127.0.0.1',
   // A phone's voice memo is small; this just needs to be well above any single recording.
   maxRequestBodySize: 1024 * 1024 * 1024,
+  /*
+    No idle timeout. This server holds a connection open while whisper works, and nothing flows on it in
+    the meantime — which is exactly what an idle timeout kills.
+
+    Unset, Bun applies its own ceiling and drops the platform's connection at around 255s. That was the
+    last of three hops still doing it: the proxy's outbound fetch and the platform's inbound timeout were
+    both fixed on 2026-08-24 and a 42-minute recording STILL died at 4m16s, because this one had not been.
+    whisperx went on and finished it, and the result was thrown away.
+
+    With diarization on, align runs at roughly 1.5x the audio duration, so an hour-long episode needs
+    ninety minutes of processing. There is no ceiling that is both safe and high enough — 255s is Bun's
+    maximum anyway, so "raise it" was never available. 0 disables it.
+  */
+  idleTimeout: 0,
   async fetch(req) {
     const url = new URL(req.url);