A couple of days ago I started Better Learning 5 at somewhere between 4 and 5 days.
For a few game days I donating almost my max to Lem to spend the points to speed up my learning, shaving off a total of about 7 hours. All of a sudden it wouldn't let me spend any more favor points (at any giant shrine)..
Is the consensus about being able to spend half of your (remaining time) incorrect? Because what I was able to spend was definitely not half of more than four days (I had just under 4 days left when it stopped letting me donate).