Testing to see the effect of loading 15 resources in sequence, with each taking 5 seconds on Googlebot time.
The server indicates this would take well over a minute. However, the requests stopped at 52 seconds. At that time requests stopped, but Googlebot logging was only at around 100ms. Googlebot continued without making more requests until it reaches the 5.5 second mark.
It seems there is a hard real-time limit in Googlebot of around 52 seconds.
Server logs indicated 10 resources were loaded with a real world delay of about 5 seconds between each request. Confirming the hard real-time limit of 50 to 55 seconds.
Crawl time in the search console matched up with the logs if it was reporting in my local time.Cookiebot