[2019] Question about the length of a clash tourney

So I tried looking this info up, but couldn't really find anything. Since this upcoming clash test will be two days of singular 8-team tourneys, how long will each tourney last on average? It should be 3 different games in one tourney, right? So adding the lock-in phase and scouting phase, it should be around a 4 hour duration until a winner is decided, right? I really want to get confirmation because I need to know how much time to put aside for clash.