I just updated the Mac app and I think the behaviour of displaying the time for each entry has changed.
I used to be able to look at the desktop app and the duration for each entry was aways shown next the each entry, however now if the description is longer than the width of the window it hides the duration to show a little more of the description.
This is not very useful for trying to quickly look at the time tracked for each entry to see if they look correct.