I have the equivalent of three sections to teach next semester: U.S. History online, and what College of Western Idaho considers a "double section" of Western Civilization. Instead of a 30 student section, I get a lecture hall that starts out with 92 students. That is three times the students of a standard section, but time spent preparing for and delivering the class is the same as a standard section. Grading papers is three times as much, so getting paid for two sections turns out to be reasonably fair.
I have taught both these classes before, so I am not starting from scratch. We have switched to new editions of the textbooks, so I do need to review the new editions, make sure that I don't have to make any big changes, and update my slides and notes. This isn't a major piece of prep, but I do need to get started this weekend on any updates or corrections for fall.