I don't believe there is a deadline for completing the course, at least for the Cardiovascular class. I think they say something like if you don't access it in a year, you lose access. I was worried a time constraint at first because I went through the lectures then got busy and had to go through them all again before taking the exam because I forgot everything. But I think you have as much time as you need to finish. Once you feel ready, you email the course instructor on your syllabus and they will open the final for you. Unfortunately, I don't think many people can take it for GPA credit (might be different for you) but I got a letter of completion with my final exam grade that I could attach to a lot of applications. If nothing else, it helped me feel a lot more confident in my knowledge about the field and increased my knowledge of genetics above what I was able to take in undergrad. I also took their lab genetic counseling course as that's an area I'm really interested in, but that one is a little different. There's no actual final, just a self assessment, because most people only take it for continuing education credits. I don't think it's as valuable as CV genetics or embryology unless you are really interested in lab jobs. I don't know as much about the neuro or other class they offer. But this was something a current student at UC suggested I do to strengthen my app and I would recommend it, too.