<con:soapui-settings xmlns:con="http://eviware.com/soapui/config">
   <con:setting id="HttpSettings@socket_timeout">300000</con:setting>
</con:soapui-settings>
<con:soapui-settings xmlns:con="http://eviware.com/soapui/config">
   <con:setting id="HttpSettings@socket_timeout">900000</con:setting>
</con:soapui-settings>

Set timeout of SoapUI to 15 minutes
Set timeout of SoapUI to 15 minutes