as far as possible
Also, so far as possible. To the greatest extent, degree, or amount that is attainable. For example, I want to drive as far as possible today, or It was very complicated, but he promised to explain it so far as possible.
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.