Let's say your attorney charges $250/hour, and you expect to need up to 40 hours of work on short notice. That's 40 * $250 = $10,000.

If the business ran into legal trouble and had to use up the 40 hours, it wouldn't automatically result in the attorney cutting off services. Most likely, if the attorney thought the business was solvent, s/he would continue working, and would invoice the business for anything above the $10,000.