A person convicted for the first time of OUI may be imprisoned for up to 364 days, fined up to $2,500, and have watercraft operating privileges suspended for up to two years.
There is no "typical" sentence. You CAN be convicted of the maximum penalty.
Often there are other factors that are relevant such as your .bac and/or any other accompanying charges you may have as well as any priors.
In Illinois, operating under the influence (OUI) is a Class “A” misdemeanor for the first offense. It is punishable by a maximum of six months to one year in jail and/or up to $2,500 in fines. And, it is very likely your previous dui WILL matter. Illinois has heightened its attention to boating/ operating under the influence recently. It is possible that your past dui will result in an increased mandatory sentence based on the previous conviction. It is important you seek legal counsel on this matter immediately to ensure an adequate defense may be prepared.