On my phone, so keeping it kind of short.
Normally we have one day with a 2,000 meter fin, one day were we tread for a decent while and then go to underwater 50m/ freestyle 50m laps. one day of leap frogs (you go in the same lane, one guy does a freestyle on top, the second is doing underwaters. Get to the end, guy a does 10 burpees, guy b does 10 flutter kicks/10 sit ups and then swap), normally followed by more freestyles. Day 4 is normally an open water swim at the lake (3,300 meters total. Feels like I've been murdered on those days). He mixes in drown proofing stuff for me too, like buddy breathing, underwater knots, etc...
Those are all the basics, little things mixed in. Doesn't seem bad, but it's rough.
It's all dependent on his mood, though. We had one day where he just made me tread for almost 2 hours.