No one really knows, and be wary of those that offer some time of date- often to scare you into buying a product. All people are very different, and thus no can scientifically say with accuracy how fast or slow the hair loss process will be- even by looking at parents/ relatives. The earlier hair loss is dealt with, the better the chances that a solution will occur. When it comes to hair loss, it is best to be proactive. Also, when dealt with early, it is harder for those you see regularly such as co-workers and friends to notice any treatment changes that occur. Hair loss should be dealt with as soon as possible.