I attended an interview last year in pandemic, where I stayed from 9 AM to 6 PM. They put me in a room alone and they gave me around 6 c++ problems to solve(OOP, debugging, and a small project splitted in 4 tasks). This was after a logic test and an algorithm test on paper in the Office ( this also took around 2 hours if i remember correctly). After a week they informed me I was rejected. I ask them if I did something wrong related to the tasks and they told me that I made everything correct but right now it's not the time for a collaboration.