Process Data Scientist and Process Mining Architect interview questions

HR interview, followed by take-home task. The HR person is very polite and to the point, usual HR questions were asked. The first meeting was very straightforward. Second round was a take home assignment, which was said to be simple and shouldn't take more than 4 hours. Except it was very complex and took over 2 days to complete. Overall, it was an ok experience and they seem nice.