UBS Director Evidence Lab interview questions

After applying on the website, got a call back from HR and set up a couple of rounds of interviews. Everything has been going smoothly and feedback/communication has been great. Then I received an assignment, which was supposed to replicate typical briefs. I was asked to complete the assignment in 6 hours. In reality it took much longer to complete - I honestly don't know how it's humanly possible to produce anything of sufficient quality within the allotted time, unless you are very much a specialist in the industries in question. I haven't heard back from anyone after submitting the test, even after asking a follow-up question to HR. It's been 2 months - and nothing. This is extremely rude, considering how much effort I have put into the interview process and the assignment.