BGP Session Timeout

I have a question regarding BGP session time outs. Is it likely that BGP times out before underlying IP topology reconvergences after a link/node failure? Do service providers ever set such low values of BGP timeouts that BGP timeout will occur? If not, what else may cause a BGP session to time out? -- Muhammad Saqib Ilyas PhD Student, Computer Science and Engineering Lahore University of Management Sciences