Regarding the removal of the 16 hour ticking clock, I personally missed this plot point entirely during my first viewing. I just assumed that Rey was in such a hurry because she was acting out of hatred for Palpatine and desperately wanted to kill the person who was responsible for the murder of her parents.
I also think it will still be clear that Palpatine is ready to strike at any moment if it’s removed. So the hurry is still understandable.