My sister and her husband went to Hawaii and were certified by PADI in 3 days just like your friend is scheduled to be. They have not dove since (5 years ago) but dove quite in the days following the class. I guess it works out for those who take it.
Here is an example of a recent class for SSI:
Fri night, 2 hours class
Sat 4 hours class, 3 hours pool
Sun 2 hours class, 2 hours pool, written test
1 week later:
Sat 3 open water dives
Sun 2-3 open water dives
Yeah, not sure how PADI fits that in within a 3 day period unless book work was done on their own before they got there.
Here is an example of a recent class for SSI:
Fri night, 2 hours class
Sat 4 hours class, 3 hours pool
Sun 2 hours class, 2 hours pool, written test
1 week later:
Sat 3 open water dives
Sun 2-3 open water dives
Yeah, not sure how PADI fits that in within a 3 day period unless book work was done on their own before they got there.