Better not go there before 10am in the morning, many visitors in group. It is closed on 12:00, go there around 11:00. It is not allow to make any stop inside the mausoleum, visitors should keep walking in and through finally out of the hall. So, it does not take long time. I went there in early may and lots of visitors making lines in front of me. It take 20 minuttes for me to get inside.