1 month. 1 call interview from HR, 2 call interview from team leader or manager and F2F interview with 2 team leaders. Basic questions and examples.
I was a quick and easy process for me. I already relocated to Ireland before applying for any jobs. I had my contract within 3 weeks and passed 3 rounds of interviews ( 1st interview over the phone by an in house recruiter, 2nd with the hiring manager in IE and the 3rd with another manager from the German team).
Hertz hire almost anyone. Just don't expect a decent salary or benefits.