XSP.submitLatency is a property associated with the XPage which governs the amount of time a pratial refresh can take in XPages. Exceeding which you get the "timeout exceeded" error asking you to refresh the entire page or cancel.
One of the most irritating errors that I have encountered in xpages. I even felt helpless against these errors in many cases :(
Thank god i found this in the 8.5 developerworks forum.
The following is a method to over ride it.
XSP.submitLatency = 60000; //timeout limit increased to 60 seconds
Hope this saves developers from going through the ones I crossed.