You paid 6+ presumably stressful hours of your time. That sounds like a crazy high price to me that you should be able to bill them for.

I wonder whether they could've done it faster if they were required to reimburse you for the time and nerves you had to spend to get them to fulfill their (assuming you were within warranty) law-mandated responsibility of providing you with a product that works as described.

How did you even get to the point of talking to them on the phone? When I last had a problem (extreme instability up to full crashes when RAM pressure is high, which is apparently a problem with every single ARM Mac out there) they wanted me to come into an authorized store as the first thing.

I eventually caved in and just bought a machine with bigger RAM. My god, I can't imagine spending several hours over several days turning the device off and on, resetting NVRAM and re-installing the system ...