thanks for the tip! at least now I have a goal that's not story dependent. I can get by that, setting a small goal for my limited time. and I believe achieving that personal goal will give me more satisfaction than finishing a part of a story in one run. because I expect to drag this game out as long as I can.
I'm not young anymore where finishing as many games as possible is the goal, I'm an old gamer where enjoyment of even a few intervals of play is sufficient.