It depends on the course in question.
Let's say you are with PADI, who I do my diving with...
For the original Open Water Course, you usually have two days in which you have the lessons from your instructor and your confined dives.
However, there is a book that they expect you to read, make notes, and do the quizzes, and the summary. I am warning you, they are rather long. If you have to work, or do school and homework on top of it, leave yourself 2-3 weeks beforehand, just so you can go through it slowly, and carefully.
There is a test at the end of it, in which you must get 75% in it to pass. you can always take it again, that same day, but what is the point.
Then you need 4 open water dives to do afterwards.
The advanced open water has less theory, but more practical
This is the same with the Rescue Diver Course, and the major ones.
You also have the speciality courses.
Some of these require both theory and practical and a theory test.
Some require theory, practical, and then a practical test.
Some require theory and theory test.
the speciality courses all have theory booklets that you must read and complete, however, this is only around 60 pages, nothing like the open water
So it really depends I'm afraid
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