The most important factor is how long are the supporters of those terrorists are keep going to keep supporting them, especially Turkey, Qatar, Saudi Arabia, with endorsements of some Western countries including United States, if you don't have that support it won't take more than a few months....That depends on how much the support of terrorist have in Turkey, in Saudi money to have more terrorists coming to Syria, their aim is to prolong the war, so they can prolong it if they want, they've already succeeded in that. That depends on that. If you're talking about how much is going to take as only Syrian conflict, isolated conflict, this is what it won't take for a few months but if it is not isolated conflict as it is the case today, with the interferences of many regional and international powers, it will be going to take some time, and no one has the answer as we have, of course, nobody knows how the war is going to develop...