OP: You sound like you have my former job! My boss was OK with me going to school, but I *had* to attend mandatory meetings that were a waste of time and she was not willing to budge on my work schedule except to give me part-time hours that were not the same every week. This would have interfered with my class schedule and day care arrangements. So, to her surprise I submitted my letter of resignation and I found another job.
Anyway, if it was not for online courses offered this semester (I am taking 3), I would not have as much money saved right now to cover future Day Care expenses (mainly for my 12 hour clinical days). However, I agree with the others that there appears to be a lot more work in some online courses then people receive offline.
Some offline courses I have taken were the exception to this rule (A&P I and A&P II), but many others were not. Most my offline professors dropped an objective or changed a lecture or exam date due to whining students or his/her mood that day. Whereas online courses stick to their objectives and due dates, which is why I like online courses.
I suggest if you have NEVER taken an online course before and the subject is relatively difficult because they are time consuming (Biology, Math, Chem), you may just want to take one course. If you are taking a subject that is easy to learn for the average person (History, English, etc), then I encourage taking two.
Being successful in online courses is about time management, as others have posted. It is also about your ability to teach yourself materials and be able to apply it using the methods presented to you (essays, exams, projects, calculations etc.). I am up on 4 hours of sleep because of my Nutrition class and this is not an exam or quiz week. I also do not do anything at the last minute.