A closed-form heuristic formula to calculate the delay quantile for a netwo
rk consisting of identically loaded, independent nodes modelled as M/G/1 qu
eues is introduced. The accuracy of thr heuristic formula is demonstrated b
y means of some numerical examples, Since the heuristic formula is closed-f
orm, accurate, and explicitly shows the influence of certain network parame
ters, it is the preferred method to perform sensitivity studies.