how many miles must you drive a 2005 ford tarus on 2012 Ford Taurus

after resetting the computer how many miles must you drive before it can pass emissions

2 answers
What year is it? Surely a 05 but you also say 2012 ,but that can't be.
If you are just going to drive it about 50 miles. Who reset the computer?
Did they use a scanner?
50 miles should reset monitors but you may have a pending code that is preventing it from resetting.