diff --git a/assets/diagnostics/index.html b/assets/diagnostics/index.html
index 0b4fdb6..d135002 100644
--- a/assets/diagnostics/index.html
+++ b/assets/diagnostics/index.html
@@ -215,8 +215,8 @@
     </p>
     <div class="mtr-form">
       <div class="form-group">
-        <label for="pkt-count">Packet count (1–20)</label>
-        <input type="number" id="pkt-count" value="5" min="1" max="20">
+        <label for="pkt-count">Packet count (1–100)</label>
+        <input type="number" id="pkt-count" value="5" min="1" max="100">
       </div>
       <button class="btn" id="mtr-btn" onclick="runMtr()">Run MTR</button>
       <span class="spinner" id="mtr-spinner"></span>
@@ -277,7 +277,7 @@
         <strong>Interval</strong> to <code class="code-inline">1000 ms</code>.
       </li>
       <li>
-        Click <strong>Start</strong> and let it run for at least 60 seconds (100+ packets).
+        Click <strong>Start</strong> and let it run for at least <strong>300 packets</strong> (about 5 minutes).
       </li>
       <li>
         Click <strong>Export TEXT</strong> to save the results, then share them with your support team.
@@ -311,8 +311,8 @@ async function runMtr() {
   // Validate input
   const countInput = document.getElementById('pkt-count');
   const count = parseInt(countInput.value, 10);
-  if (isNaN(count) || count < 1 || count > 20) {
-    statusEl.innerHTML = '<span class="status-tag tag-error">Packet count must be 1–20</span>';
+  if (isNaN(count) || count < 1 || count > 100) {
+    statusEl.innerHTML = '<span class="status-tag tag-error">Packet count must be 1–100</span>';
     return;
   }
 
diff --git a/assets/diagnostics/mtr-backend.py b/assets/diagnostics/mtr-backend.py
index 5c763b2..019117c 100644
--- a/assets/diagnostics/mtr-backend.py
+++ b/assets/diagnostics/mtr-backend.py
@@ -20,10 +20,10 @@ from threading import Lock
 from urllib.parse import parse_qs, urlparse
 
 # ── Constants ──────────────────────────────────────────────────────────────────
-MAX_PACKET_COUNT = 20
+MAX_PACKET_COUNT = 100
 MIN_PACKET_COUNT = 1
 DEFAULT_PACKET_COUNT = 5
-MTR_TIMEOUT = 90         # seconds: mtr max run time
+MTR_TIMEOUT = 360        # seconds: mtr max run time (100 packets × ~3s margin)
 RATE_LIMIT_WINDOW = 60   # seconds
 RATE_LIMIT_MAX = 3       # requests per window per IP
 MTR_BIN = "/usr/bin/mtr"