Recovery time is shown in hours. However the screen also contains a coloured ring which can be green, orange or red. Initially I thought that it just visually shows the number and they correspond to certain intervals of hours. However, if I remember correctly, there were a couple of circumstances where the number of hours was the same but sometimes the ring was green and sometimes orange. Where can I find information about the meaning of those colours? Also, bonus question :), What is the system behind the length of each colored line? Thanks!
