Why limit a registration to two hours?
Because they thought 1 hour was not long enough? I can't believe you asked that question.
It's an online registration, right? So why have a limit at all? There's absolutely no reason. You should open the registration and keep it open until one of two things happens:
A) The zoom class fills up.
B) 'x' hours before the class starts.
Now, if you look at the actual link, it says you'll have to do an online portion of about 4.5 hours (must be completed a week before the zoom class), and the zoom class is 2 hours. So I bet the date/time in the article is for the class itself, NOT the registration.