For the purposes of this article, the following definitions are used 10: early hyperacute: 0 to 6 hours late hyperacute: 6 to 24 hours acute: 24 hours to 1 week subacute: 1 to 3 weeks chronic: more than 3 weeks The above definition of hyperacute as 0 - 24 hours and acute as 1 - 7 days was affirmed by the international Stroke Recovery and Rehabilitation Roundtable 19.