To increase say the send timeout of the WCF Test client
Run the Service from Visual Studio while the Test client is up or running
do the following
1. Right click on the config file
2. select "Copy full Path" from the popup
3. Paste the path into the address bar of a window after,
delete the file path up to the first back slash from the right
and press enter or return.
4. Edit the config file with your preferred text editor adding
the required time out and save the file.
5. Now click the Tools menu and select options then un-check
"Always regenerate config when launching services" and click OK.
its done.