In Chrome, how many redirects are "too many"?

Google Chrome 17.0.963.56 allows a maximum of 20 redirects, as tested with this PHP script:

<?php
    $redirect = (isset($_GET['redirect'])) ? $_GET['redirect'] : 0;
    header("Location: redirects.php?redirect=" . ($redirect + 1));
?>

Chrome aborts with error 310 when trying to open redirects.php?redirect=21, which means that the first 20 redirects were successful.

Tested on Win 7 64bit

• Chrome 64bit Version: 49 ↷ 80.0.3987.132 (Official Build), 19 redirects
  
• Chrome Canary 64bit, Version: 49 ↷ 88.0.4306.2 (Official Build), 19 redirects
  
• Firefox 32-bit version: 43 ↷ 74, 20 redirects
  
• Firefox 64-bit version: 43 ↷ 74, 20 redirects
  
  • Firefox 64-bit 67.0.4, endless loop!
    
• Opera version: 28, ↷ 65.0.3467.62 19 redirects
  
• Safari version: 5.1.7, 16 redirects
  
• IE version: 8 11 redirects via webpagetest.org
  
• IE version: 9 121 redirects via webpagetest.org
  
• IE version: 10 121 redirects via webpagetest.org
  
• IE version: 11.48.17134.0 110 redirects
  
• Microsoft Edge version: 42.17134.1.0 20 redirects
  
• Google Nexus 5, Samsung Galaxy S4 ⇄ S9, Galaxy Tab 4, 19 redirects