my only two deaths in my original singleplayer playthrough were due to learning that you can’t just charge every mob with leather armor in my first burial ground and dying due to me not knowing serpents existed and running into one on a raft, both happened before I had like 8-10 hours in the game and both wouldn’t have happened now that I know what I’m doing

so it’s certainly possible to go deathless and honestly I don’t think it’s very hard considering I’ve still yet to die on single player again in this game and am like 100+ ig days past killing yagluth

In terms of hours to complete, if you go pure progression based to kill the bosses without building any more bases past your meadows base you can complete the game in 50-60 hours, take it a bit slower and it might take you 70-80hrs (it took me 88hrs to beat it but I build two very large bases late game which ate up quite some time)