need a hand with partition size

[Megatron-X]

hello every one.

i am i need of a hand. i am currently trying to install fedora core 6 on my pc, but seem to be stuck on figuring out what best partition size to add in disk druid. i've searched around and read that having every thing in one is a bad thing because /var can fill up and halt the system and some other things.
i've tried to figure out what is at least the best partition for a 40gb hdd. i already have /home to take the 80gb hdd (for raw music files, etc.).
i know for /boot 100mb is good which i have set for the 40gb and 1gb for swap. the other's i'm totally stuck.

can some one please help me out?

/ =
/var =
/tmp =
/usr =
/usr/local =
/opt =

thank you. :)

[leigh123linux]

/ =4
/var =6
/tmp =10
/usr =10
/usr/local =5
/opt =5

[Megatron-X]

/ =4
/var =6
/tmp =10
/usr =10
/usr/local =5
/opt =5
thank you very much leigh123 for your help. may i ask why /var is big? what would actually happen if /var gets full? can the logs be deleted or some thing? :confused: