My environment is Oracle 9i. I want to estimate the size of export file. The option estimate_only=y can be set in expdp command. In Oracle 9i, we use exp command to export database not expdp. How to estimate the size of export without running export in Oracle 9i environment?

Is there any process to make export exp & import imp faster??. and how do i calculated how much time import (original imp utility) takes without actually doing import?( imp)