I agree you always want to err on the side of caution. That being said, lets take cobra1683 post
http://www.expertpcsupport.com/forum/bodybuilding-supplements/real-deal-654363.html
Had he come back and said, "Damn after 5 weeks my head was pounding and had really bad side pains, ect". Everyone here would have said..."See I told you so, can't take this stuff for more than 4 weeks". Not only did he do 3 caps/day of Diesel for 8 weeks, he upped the Tren to 4 caps/day. I guarantee had he posted the cycle before taking it he would have had negative feedback from it. Instead he just went ahead and did it, posted a before and after pic and everyone is blown away.
I think because we know there is a lot of risk in doing an oral cycle for that long we also take extra precaution and run tons of liver support and BP support along with a clean diet. If you are already overweight or have fatty liver to start with or use to drink excessively (probably like a lot of these college kids do, after all you feel like the man while you're on you want to go out and get drunk and laid RIGHT?) you shouldn't be taking it for more than 4 weeks.
I think both sonic and dabuffguy are correct, no one on here will ever advise to take these products for more than 4-6 weeks, but I think if you take tons of precautionary measures, like cobra1683 did, you will be ok and see some pretty good results.
Curious as to others thoughts on this...
needto is probably preparing his 10 paragraph post as I type this.