Well, one thing some Amber characters specifically do to give themselves more time is practically akin to go venturing off in the NeverNever. For Amber, it is venturing off into particular worlds that have different rates of time relative to Amber. I think it is the further you travel from Amber, the more different and perhaps different time rates are. So, if Maggie Sr. is adventuring in NeverNever lots and other characters not originating solely from DF are effectively walking about in the NN, there becomes an increasing likelihood that Maggie Sr. path may intersect with one of these other characters since the Dresdenverse is a metaverse containing these other cultural universes.
So, I still wonder about Malcolm Dresden and Mac.