How many miles is to much for a Honda Accord?

How many miles is to much for a Honda Accord? - 1

Probably a million or two.

Anything over 300k miles it might be starting to get tired. However, as long as it has been fully and properly serviced and maintained it can go indefinitely.

Depends. If you're buying than 300k. If you're keeping it than 600k.

150,000. Anything that is close to 10 years old will need to have parts replaced soon as well.

When it starts to run like clap. There's no hard line "when or how far is too far" it depends on how well it has been maintained.