Lifetime donor availability for FUE -vs- FUT

[Dav7]

I'm just wondering if anybody has knowledge of, or references for the donor availability of FUE and FUT? I remember hearing that the average person has 6,000-8,000 grafts over a lifetime, but is this for FUT alone? I've been hearing recently that FUE yields less grafts from the donor site than FUT over a lifetime and this has me worried. Even though I would prefer to undergo FUE for various reasons, I also do not want to undermine my future regarding graft availability in the donor area.

Does FUE really yield less grafts from the donor area over a lifetime than FUT, and if so, by how much?