I was recently hired as a participant in the TLDP. The interview process from application submission to offer was about a month. I applied, interviewed in a week and a half (2 in one day - One with HR, one with a developer) and heard back in two weeks. Both interviewers were very involved and wanted to have a conversation with you rather than make it feel like an interrogation. One of the interviewers even asked "So how was the interview?" to me. That was the first time I was asked that by the person who conducted the interview. I don't know if this is a common practice but it made me feel recognized as human and solidified my interest in working for the company.