I see nothing against him if it is only for the service scenarios that I assume. Some database maintenance or import scenarios can be time consuming. However, CRM in everyday use should not.
Just remember this from the PHP manual at max_execution_time :
Your web server may have other timeout configurations that may also interrupt PHP execution. Apache has a Timeout directive, and IIS has a CGI timeout function. Both defaults to 300 seconds. See your web server documentation for more information.
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