System Copy and Logical system name conversion

Hello All,

Can any one let me know some inputs over these few queries.

1. How much time would a 500+GB clients take for Export and reimport after the system copy.

2. What would be run time of the BDLSS report ( Converting the logical system names) for a typical 1500 GB QTY system

The requirement is my QTY has 3 clients, and i would like to refresh it with my PRD data. How do i safely perform thia activity with the least downtine possible and please note, the clients are around 500+ GB huge..

Thanks in advance for your inputs.

Rgds,

Sri