postgresql basic info

Hello,
I am Oracle DBA and i will be maybe work on a project where postgresql database will be used.
So i would be greatful if you could please advise me on the folowing :

* Estimated time for postgresql latest RDBMS software instalation and configuration (does it takes longer on windows or on linux)

* Are there any prefered OS, like windows or linux etc ... ?

* Estimated time for import of 50gb of data from older postgres to the newly instaled postgres?

Thanks.

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