It would all depend on the script. I've seen scripts distributed with mIRC, as about 99.9% of them are even though it's against the licence and some are under 2MB while others are upto 10MB. The few scripts I have seen distributed without mIRC range from a few hundred KB upto about 6MB. It would depend on how 'pretty' things are and depend on the amount of third party contributions such as DLL files and DOS/Windows based games are included.
