how long for ime rating

[brushhog]

hello all,i live in tennessee,and have been on wc for this injury for 18 months,which resulted me going on disability,disability and wc both know the situation,my children only draw disabilty check from me,and i am still getting checks weekly from wc,the orginial doctor refused to see me because he said i have arthritis,although when i had blood work done for it all results were negative.wc sent me to me to a indepent medical examiner who sent me to a functional capacity test,i obtained the results of the test and they are as i expected,i'm going on the fourth month waiting for a rating from the ime doctor,i think they are allowed a reasonable time limit to complete rating but,has anyone ever had this happen or know what that reassonable time limit is? thanks for any help