No comment ?
Why do you export all of it? IF you have test environment,just export your package scenarios.You don't need to export work and master repository,or your projects.
Because,logically on test (preprod) and prod environments ,you shouldn't make development.You just execute scenarios.
I was expecting your ODI Version. ODI takes time based on your project complexity. How many projects/scenarios/days of logs you have in your repository? I am really not sure whether you have one execution type test repository or development one. Again you didnt mention whether you are importing to remote repository or a repository that is LOCAL/LAN connected.