If you enter time that has more than 60 minutes
(ex: 4:75), and hit save, the system throws an
error. I lost all unsaved entries because I refreshed the page when I saw the error message. I tested it again, and found that if I hit the "back to journyx" button, the valid entries were saved - it would make more sense to save the valid entries before displaying the error page.
The handling of invalid characters (ie entering text instead of a time) is handled very well - as is the conversion from decimal hours to HH:MM. It would be nice if the invalid number of minutes received similar treatment.