I just noticed that the Time studied is now displayed in hours (0.82, 1.82, etc...) which I don't find very natural to read... I liked it better displayed in minutes, in one glance I was able to to know whether or not I'd fulfilled the 20 minutes for the challenge ^_^
and well, it's simpler to convert 180 minutes to 1 hour and 20 minutes, than 0.73 hour to 43.8 minutes.