The X amount of days always made me paranoid that I couldn't explore as thoroughly as I could because I wasn't sure how close I was going to be able to cut it and complete that task.
Agreed. Personally I loved XCOMs and Darkest Dungeons "timer lite" mechanics that simply have short term incremental punishments for not accomplishing enough in a given day. The long term "100 days to finish the game" is really hard to actually play around on your first playthrough and simply leads to paranoia.