I had a phone interview, only lasted about 20 minutes. Didn't end up getting the offer or moving on from there. Didn't get any feedback in order to determine what I could have done differently

Picked a time slot for what had clearly been indicated as a 20 minute interview, and ended up going much longer to almost 40 minutes. Interviewer was sweet but the duration of interview was offputting and I was underprepared for some of the more technical questions that were asked in the latter 20 minutes.