Definatley not 50mg! imo. That is to low of a dose to yield any results and you would be wasting it, and var is expensive. I agree that there is no need to fluctuate with it or with any ass, usually whatever dose you run, you run straight through. Many guys do run var at 100mg a day, it can be done. But it wouldnt hurt to start out at 80 and see results it yields for you, you might be happy with that. Then you could always up it to 100 if you wanted.
8 weeks would be the definate and absolute max, imo. I have ran it for 8 weeks myself, but you can still yield good results at 80mg for 6 weeks. Remember everything in this game is a risk to reward ratio to consider.
The higher the dose and the longer the duration, the more significant the gains, but also the higher the risk. As with any oral aas their is the issue of liver toxicity to take into consideration. UCDA is a good protectant and i agree with the 500mg day dose. (if you are running ar-r's stuff, i believe that would be 2 capsules a day) It also would not be a bad idea to run liv52 as well. It is a very good liver protectant and it is also very inexpensive. You can get it on amazon very cheap. Actually thier is NO reason NOT to have it. Good luck, hope i offered something