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Hi GOST1892,
In theory, it can empty your second reclebin at one time. I think it will cost a lot of time for 500gb definetely.
If you need script in detial, TechNet Forum is devote to the related question. I can only give you a direction in my ability.
Also, I have found some useful thread in TechNet forum, you can refer:
- According to the thread in Microsoft TechNet mentioned "there is no way to remove all of them. You'll need a script that does a Get-SPODeletedSite and stores that to a variable and then a ForEach loop that calls Remove-SPODeletedSite for each entry in the array stored in the variable.
2. How to delete a Big File from Second Stage Recycle Bin the second make answer.