To use a timeout value other than 30 seconds, replace

%%prettify 
{{{
myStore = new Ext.data.JsonStore({
  url: "http://foo.bar.com",
  ...
});
}}}
/%

with

%%prettify 
{{{
var myBigTimeout = 90000; // 90 sec
myStore =  new Ext.data.JsonStore({
  proxy: new Ext.data.HttpProxy({ url: "http://foo.bar.com", timeout: myBigTimeout }),
//url: "http://foo.bar.com",
  ...
});
}}}
/%

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[ExtJS | CategoryComputing.Web.JS.ExtJS]