I did my masters degree online while working a full time job, and this was before COVID made distance learning mainstream. There was a lot I struggled to adjust to, from just taking rigorous math classes after being out of school for a few years, to time management and developing good (admittedly, this part is debatable) study habits again. It's also very isolating, and the classes I did best in were the ones where the distance learning students formed a study group and would go over our answers to problem sets together before turning them in. The on campus students could do this easily, but we had to proactively reach out to each other more; nobody really used the online discussion forums.
Being able to watch lecture recordings at 2x speed (or faster, depending on the pace and how the professor talks) can be pretty clutch when you're reviewing on a time crunch.