This paper uses a mutation rate of 1.008 base substitutions/nucleotid/billion years. See some discussion of mtDNA mutation rates here and here.
European Journal of Human Genetics doi: 10.1038/ejhg.2008.224
The Etruscan timeline: a recent Anatolian connection
Francesca Brisighelli et al.
The origin of the Etruscans (the present day Tuscany, Italy), one of the most enigmatic non-Indo-European civilizations, is under intense controversy. We found novel genetic evidences on the mitochondrial DNA (mtDNA) establishing a genetic link between Anatolia and the ancient Etruria. By way of complete mtDNA genome sequencing of a novel autochthonous Tuscan branch of haplogroup U7 (namely U7a2a), we have estimated an historical time frame for the arrival of Anatolian lineages to Tuscany ranging from 1.1 ± 0.1 to 2.3 ± 0.4 kya B.P.