110 years apparently, that is the official time which quite honestly doesn't seem right to me and much of the LMs, the date system has been buggered for so long that we're just not quite sure anymore.
I know back when we left Asulon & I was an LM we talked about setting a unified time line and fixing this problem. :( was really hoping it happened. Dangit. Guess my dwarf isn't that old afterall