My maternal line goes back 14 generations. I haven't personally tested my mtDNA, but my mom's maternal cousin did the mtDNA test through FTDNA, so my result should be the same. I don't know if that should count or not, so I haven't entered it into wikitree. The cousin's mtDNA result is V16; my 23AndMe result is V, which seems to corroborate the V16. I just added some maternal grandparents to wikitree to fill out my 14 generations.