first round is phone interview ( using teams video call) talked about 1 hour about chemical engineering fundamentals then scheduled online 2 nd round 45 mins presentation 8 person 1 to 1 talk for 30 mins most are conversion talking about interest, research, possible job duties

I applied online for a process engineer 3 position last December 2017 and got an email from an HR lady asking if I'm interested in a 30 min interview for this position. She was very friendly, not intimidating, and overall, the interview went quite well. The next day, I received an email from her, inviting me to have a phone interview with the hiring manager of the team. The interview was scheduled 3 days later and he asked me to describe my research, and also some typical behavioral questions. He mentioned that since the company employers are going on a 2-week break due to the holidays, I might probably hear back sometime within the 1st or 2nd week of January. I didn't receive any update within this timeframe so I emailed the HR lady to check in. She replied that the HM will reach out to me shortly. That was last week and so far I haven't heard from them again.