A college course lasts one semester, and meets three times a week, or less. Usually, a three hour credit course requires two and a half hours of class time each week. So, the pace must be faster than it is in high school.
I once taught a mathematics course to advanced high school students taking college credit. The course was trigonometry. A high school trigonometry course goes the entire year, and meets five days, or about four and a half hours per week. The college course goes into greater depth, and a semester is shorter than half of a high school year. So, a college course covers more material in about a fifth of the time. Well, one of my students kept being called out of class for “excused” high school activities. Then, one day he approached me and said that he finally understood the difference in high school and college classes. In high school he could miss a week and they would still be drilling the same material, but in college if he missed one day he was behind, and the material was no longer being presented. It was then up to him to get caught up by reading. And, if he did not catch up, since mathematics builds on itself, things would get worse.
The above is important, since college students often take off, since there is no attendance police to chase them down. Sometimes they will miss two weeks at a time for vacation. Others will be physically present, but get behind because of text messaging. Inattention is as bad as not being in class.