T4 which has normally a half life of 6 days,and gets its stability in 6-9 weeks,can be used in long term use of a hypothyroidism patient,my query is if the patient is having TSH Level of 6.22 then how long it should be given for treatment?...like how many years?a normal 45kg,20yrs woman who has been prescribed thyronorm since 4months,and still under medication .