Bought a certified preowned BMW, which had 41900 k...

Bought a certified preowned BMW, which had 41900 km on it. I didn t pay for the extended warranty since I only purchased this car for recreational purposes. Picked it up on Feb. 1st and we were in lock down in March. Considering I m also a full time employee, was not able to drive this car more than 280 km until June 20th, when I found drivetrain malfunction error showing up on my dashboard. Brought my car for diagnosis to their service department. Initially they asked me wait for 2 hours and you can take your vehicle with you. But actually they kept me waiting for 4 hours to only get the diagnosis done. Then the Service Manager showed me a $1380 bill for fixing the issue and asked me to go home and perhaps your vehicle can be ready for tomorrow.
I m a 1st time car buyer so have 2 simple questions for you guys who have experience with other brands or other BMW dealerships.
1- how long would a dealer normally keep you waiting to get the diagnosis work done?
2-What does humanity and morale says, when you confidently go to BMW and buy their certified preowned vehicle. Then drive it less than 300km and you see an error message, which based service department diagnosis was NOT caused by the customer. They did confirm electrical default has caused this error. (Thanks for BMW Service Manager, honestly!)
Should the customer now pay for the $1300+ bill or should BMW stand by their brand and understand the pandemic situation didn t let the customer use this car more than 280 km, although their one month timeframe has past?