The default ping delay should be 90 seconds.

chrome/installer/util/master_preferences.cc

 // Copyright (c) 2009 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/installer/util/master_preferences.h"
 
 #include "base/file_util.h"
 #include "base/logging.h"
 #include "base/path_service.h"
 #include "chrome/common/json_value_serializer.h"
@@ skipping 61 matching lines @@
 const wchar_t kRequireEula[] = L"require_eula";
 // Use alternate shortcut text for the main shortcut.
 const wchar_t kAltShortcutText[] = L"alternate_shortcut_text";
 // Use alternate smaller first run info bubble.
 const wchar_t kAltFirstRunBubble[] = L"oem_bubble";
 // Boolean pref that triggers silent import of the default browser homepage.
 const wchar_t kDistroImportHomePagePref[] = L"import_home_page";
 
 bool GetDistributionPingDelay(const FilePath& master_prefs_path,
                               int& delay) {
+  // 90 seconds is the default that we want to use in case master preferences
+  // is missing or corrupt.
+  delay = 90;
   FilePath master_prefs = master_prefs_path;
   if (master_prefs.empty()) {
     if (!PathService::Get(base::DIR_EXE, &master_prefs))
       return false;
     master_prefs = master_prefs.Append(installer_util::kDefaultMasterPrefs);
   }
 
   if (!file_util::PathExists(master_prefs))
     return false;
 
@@ skipping 71 matching lines @@
     if (!tabs_list->Get(i, &entry) || !entry->GetAsString(&tab_entry)) {
       NOTREACHED();
       break;
     }
     launch_tabs.push_back(tab_entry);
   }
   return launch_tabs;
 }
 
 }  // installer_util