Only did some math for mars. I recall there are relativistic effects in the mercury orbit so the timeframe will depend on the place of the observer.
But I will give it a try, at least it will produce a story to shoot at and get the discussion started

Some Mercury facts:
[http://www.nasm.edu/ceps/rpif/mercury/rpifmerc.html]
(I will use these numbers)


other planets
[http://www.nasm.si.edu/research/ceps/rpif/rpif.cfm]

Rob tillaart