How much of a mileage if too much for a 2006 honda civic?

Mine has 126,705K.

Anything more than 12,000 miles per year. So assuming your car is 10 years old, it shouldn't have more than 120,000 miles.

How much life more more miles could i expect out of it. Btw i traded my car in for this one bc its sportier, better fuel economy and faster. Look at my previous question.

You are barely half way done, Ashely. As long as you continue to full service and maintain your Honda it has the potential to last until 300k miles.