How Long Can I Drive a Car With a faulty ECU.(2006 ford escape)?

How Long Can I Drive a Car With a faulty ECU.(2006 ford escape)?

Hmm! Not for long

Exactly what do you mean by "faulty"? Is the vehicle operational? Is the check engine light lit? You are asking an incomplete question

Until it quits running.

Until it leaves your stranded. Who told you it was bad?