Two important FastCGI settings:
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ActivityTimeout – This is the number of seconds that the FastCGI handler waits for I/O activity from a process before it is terminated. At some place you will also find this as being documented as number of seconds PHP-CGI process can run without communicating to IIS.
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RequestTimeout – This is the maximum amount of time in seconds that a FastCGI process is allowed to handle a request before it is terminated.
Important PHP INI directive for this discussion: