Newbie Question: field length

I'm making my first oracle database
and I am wondering for example
what should be the the length of some fields

this what I have at this moment.
firstname (50 chars)
surname (50 chars)
initials (15 chars)
telephone (20 chars)
fax (20 chars)
street (50 chars)
zipcode (10 chars)
city (50 chars)
country (50 chars)

Are they to long ( or to short ) ?

thanks in advance,
Johan (from Amsterdam, the Nethelands) Received on Wed Mar 01 2000 - 00:00:00 CST