They allocate three minutes, during which an RPO will ask you to describe a situation where you faced an ethical conflict.
Once I made an interview to work for a financial service. Everybody knows they are all bastards in finance, working to get more money, whatever the mean. Could I work for such bastards, selling my souls for money in return? I solved that ethical conflict by choosing not to get wealthier but being still able to look at myself in the mirror.