^^Agree w/Trev^^
Anavar at anything over 15mg/day will suppress HPTA enough to require a small PCT... and under 15mg/day, will give you very few VISUAL results. I'd say if you're running Anavar (var) around 20-30mg/day, you could run it long term if your using your liver supps/milk thistle and drinking your 1-2 gallon of water a day. Anavar (var) is very mild and mostly metabolized in the kindneys. If running 50-60mg/day, you'll be fine running it up to 10 weeks.
Regarding T3, you can run it until you achieve your goal. There are studies that showed thyroid function bounced right back after stopping T3, even for people who were on it a year+