The timeout property can be set for the WCF Service client call using binding tag.

<client>

<endpoint

...

binding = "wsHttpBinding"

bindingConfiguration = "LongTimeout"

...

/>

</client>

<bindings>

<wsHttpBinding>

<binding name = "LongTimeout" sendTimeout = "00:04:00"/>

</wsHttpBinding>

</bindings>

If no timeout has been specified, the default is considered as 1 minute.