I have picked this up again since new PC, as I don't have to worry about my framerate randomly deciding to shit itself because the engine was doing something slightly different to what it was doing 85 seconds ago when I thought I'd finally got all the settings right. (Last time around I stopped in the middle of Level 2 and decided it'd be one to start again when I got a better computer.)
So what's what I've done. My saves from last time were still available because CLOUD but I thought it'd be better to start from fresh to re-familiarise myself with it all, and also switch from Emily to Corvo as I wasn't much feeling it for Emily.
Finished Level 2 last night, linear time for the level was nearly 4 hours but if you count going back to saves to retry the same sections multiple times to get encounters I was satisfied with I'd say you could safely add another couple of hours onto that.
First run through will be low chaos with zero kills, and then I'll go for the high chaos KILL EVERYTHING run afterwards. (Low chaos is a lot more difficult, especially with zero kills, but so satisfying when you negotiate a tricky section and manage to get through with nothing more violent than strangling a few guards.)
I like the phrase DocG used earlier in this thread, that each level is 'picked clean' before moving onto the next. (The game design is clearly designed to encourage this, as enemies never repsawn or wake up (even between saves/loads and closing the game down and opening it up again)), and you almost never find yourself moving past a point where it becomes impossible to retrace your steps to earlier in the level to find stuff you've missed. If you are triggering something that would cause this to happen, you get an onscreen choice to move on or stay where you are for longer.
I also like to work out all the different ways that could be employed to get past a major obstacle in any given level, so for example the big 'wall' as it were in Level 2 is a Wall Of Light that you have to get past. I found four ways to get past it (traverse upwards and around, kill the power, possess and evade, go through an infested building), and there may have been more.
EDIT - Turns out there were 5 -
http://www.ign.com/wikis/dishonored-2/M ... _the_WorldEnd of level screen from Level 2, there are another couple of screens that list extra objectives and challenges, all of which were completed. (Quite surprised I missed so many coins.)
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