With luck you might have to wait a long time !
see
http://www.joslin.org/1083_3480.asp
It also seems to be the case that at least in some cases of later onset, beta cell loss is a much more gradual process than with childhood onset.
The graph (fig 1) in this paper about LADA describes a model of beta cells being destroyed very rapidly in childhood but for some people, those who develop it later, a series of autoimmune attacks each diminishing the beta cell mass followed by a partial regeneration. I think that I'm lucky and am one of those who took a long, long time to develop it and sometimes I am convinced that I still have some function of my own left.
http://care.diabetesjournals.org/cgi/content/full/24/8/1460