4 online interviews (2 1:1s and 2 panels) and I haven't heard from them since then - I found out I was rejected from the system. The conversation during panels were rather dry and focused only on very narrow aspects of the job. I felt like interviewed for a different position than applied so not sure on their expectations from the candidates. I don't regret being rejected. I just think would be respectful to send 2-3 sentences of feedback.