The response time limit
in App Engine is one hour, so it is intended that you receive the error
message after one hour. Using manual scaling in the Flexible environment
doesn’t affect that.
Could you tell us why you need your requests to last for over an hour? It
might be that App Engine is not the best suited product for your needs.
You should also note that very heavy traffic might result in your server
serving a 504 error. I recommend that you scale up the number of your
based on your traffic estimation or set it as automatic scaling.
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