Feature/57 don't display time on weekends

[Trello Card](https://trello.com/c/HEihTyLf/57-weekend-schedule-don-t-display-times)

Students can choose to spread out the work over Sat/Sun as they please.

start_time will still be specified to facilitate ordering. The estimated duration should be displayed in it's place instead

Fixed as discussed changing Min to m and making less if else calls