A manifestation determination must be held within 10 school days of the decision to change the placement. (20 USC 1415(k)(1)(E)(i); 34 CFR 300.530(e)(1))

Parents/guardian/SESP must receive notice of the manifestation determination at the same time the decision to change the placement is made. (20 USC 1415(k)(1)(H); 34 CFR 300.530(h))

From Here.