I asked the same question a while back... and got roughly the same answer.... About a year, with the same degree of potency. Iceman was correct, cool & dry place.
I have heard a year minimum. A number of people will tell you that once converted the oil acts as a buffer and that the tren is good for longer. I have not been able to test it myself and the longest I have heard anyone claim to have kept it successfuly is about 18 months.
Well if it has to be stored in a cool place, then guys don't bother buying ANY mexican gear for it gets to be 100 degress down their and for anyone that has been in a vet shop in TJ or anywhere in mexico, it can get up to well over 100 degress......