so what is this rate of decrease?? - i have yet to see a suggestion? is it .25 of a mag a day - half a magnitude? a whole magnitude!!?? what?
that would be much more interesting to know

EDIT: bear in my mind, to my knowledge, i believe the MAXIMUM rate of linear increase/decrease in magnitude for a comet under normal circumstances (ie no disruption, defunctness edit: forward scattering, which was over on monday?) is about half a magnitude a day - extrapolate that to the weekend