What is "AsyncPostBackTimeout" Property in ajax?

1. AsyncPostBackTimeout Property specifies the time, in seconds, before an asynchronous postback timeout occurs if no response is received from the server.
2. The default value of this property is 90 (seconds).
3. We can also set the user defined error message using "asyncpostbackerrormessage" property (as shown in the code above) for the time out.

    Example:

<asp:ScriptManager ID="scriptManager1" runat="server" AsyncPostBackErrorMessage="We can not serve your request at this moment. Please Again later." AsyncPostBackTimeout="160">

</asp:ScriptManager>