It depends on the state. And it may also be from when the malpractice occurred rather than when the suit is settled.
Legal malpractice is very hard to prove unless they miss a deadline or something obvious like that. The rest is a lot of different opinion on what most lawyers would do.
The time limit can be as short as a year or up to three years, depending on the state. It can also vary from when you discover the malpractice.
You also have to prove their actions caused damages to you.
You should contact a legal malpractice attorney as soon as possible so you don't blow the deadline. The initial consultation should be free, although they may be able to tell you that you don't have a case on the phone. Don't call medical malpractice attorneys, they don't do that kind of case.
You may have to do an online search for legal malpractice for your state. Don't limit yourself to the phone book.

