i don't think there is any "standard" courseload from post-bacc to post-bacc; however, the courseload and its curricula will vary based upon the goal of the post-bacc program itself: ie, fulfill pre-med reqs vs demonstrate high gpa in advanced sciences
personally, my program involves 32 credits over two semesters. these are classes taken with masters and phd students in the respective fields. histology, biochemistry, physiology, and anatomy make up the first semester--and i have completely forgotten what the 2nd semester involves. i am not working at all during this time
you may want to weigh your options vis a vis one year and two year programs (or certificate vs. masters programs) if youre interested in working
if you are concerned about whether the programs youre considering are intense enough for your goals, i think it might be best to err on the side of over-intensity
just my $.02