Coursera 19 hours worth of material , 6 weeks long 19 hours worth of material , 6 weeks long

Coursera 60 hours worth of material , 11 weeks long 60 hours worth of material , 11 weeks long

Coursera 23 hours worth of material , 6 weeks long 23 hours worth of material , 6 weeks long

Coursera 23 hours worth of material , 7 weeks long 23 hours worth of material , 7 weeks long

Complexity Explorer 2-4 hours a week , 7 weeks long 2-4 hours a week , 7 weeks long

edX 4-5 hours a week , 14 weeks long 4-5 hours a week , 14 weeks long

Coursera 8 hours worth of material , 4 weeks long 8 hours worth of material , 4 weeks long