I saved the entire BLaw section for last and only studied it in total about 10-15 hours. Since I was strong on the tax side, I wasn't worried. If I had not been stronger in Tax I would have spent more time with it because, according to the blueprints, it can show up a ton. Each test is different. You never know what you are going to get. Gage how strong you are on the rest of the material and make sure you are familiar with each business law section. My advice: Don't sacrifice knowing your tax to know business law, but if you have the time, spend 80% of your time on Tax and at least 20% on business law.
@Mvhoover is correct. Tax should be your main focus. If you are strong on Tax, it will carry you through Business Law, which is actually easier to study for than Tax, imo, but is not a big enough part of the exam for it to be your main priority. You can literally cram Business Law and Professional Responsibility in a day or two and just regurgitate it from short-term memory on exam day and get a good score on those questions.