I would probably start at 50mcg/day for a week and work up through a week at 75mcg/day upto 100mcg/day if you find it ok and the results are coming as you want them mate, run as long as you want.
There have been studies of people who were misdiagnosed as being hypothyroid and put on thyroid hormone replacement for as long as 30 years. When the medication was withdrawn, their thyroids returned to normal within the same timeframe (around 2 weeks) as those dosing only a few days, so length of time on doesn't affect function or recovery mate. Here are a few key studies as example........
(Greer,M. N Engl J Med 244:385, 1951)
J Clin Endocrinol Metab 1975 Jul;41(1):70-80
Patterns off recovery of the hypothalamic-pituitary-thyroid axis in patients taken of chronic thyroid therapy.
Krugman LG, Hershman JM, Chopra IJ, Levine GA, Pekary E, Geffner DL, Chua Teco GN.
J Clin Endocrinol Metab 1975 Aug;41(2):229-34
The significance of partial suppressibility of serum thyroxine by triidothyronine administration in euthyroid man.
Duick DS, Stein RB, Warren DW, Nicoloff JT.
N Engl J Med 1975 Oct 2;293(14):681-4
Recovery of pituitary thyrotropic function after withdrawal of prolonged thyroid-suppression therapy.
Vagenakis AG, Braverman LE, Azizi F, Portinay GI, Ingbar SH.
Bigfella.
<message edited by Bigfella on 10 February 2012 13:07>