Disk Size for Windows XP

Helo Friends,

My Computer is:

Pentium III 1.1 Gb

256 Mb SDRAM PC133

60 Gb Disk

Windows XP Service Pack 1

My question is.

What is the best size for the Partition running the O.S.?

The question is because the boot of Windows isvery slow, it takes about 3 or 4 minutes.

Thanks for the answer.

Best regards

Jos? Paiva