We know now that you can save your progress occasionally, and saved progress and loot drops reset every Tuesday. My plan is to play from Sept. 9th Tuesday until the next Tuesday (Sept. 16th), and hope that within that week I can give it a shot. Start with my team on Tuesday the moment it resets, and take small breaks at each save point. Having a good team and communication is key. After beating it on normal, you unlock the hard mode. We will start the hard mode the following Tuesday when it resets again.