@kiteboarder There are two YT channels having looked into real world battery degradation in detail. Ove Kröger - T&T Mobility and TeslaBjorn.
Ove is a certified Tesla expert and helps clients buy new and used Teslas. He has a device reading the full battery, incl how much it was charged on AC, how much on DC and what the degradation is.
Fast fact - charge it on AC and it will last forever with almost no degradation.
The ceos expect minimal 3 years and upto 5 pending how well you take care of it.