It doesn't sound like anything that would be uttered by a native-speaker of English unless it was in a poem or song. I can only guess that the intended meaning is something along the lines of -
"It looks like you are in the middle of the journey of a lifetime."
This means that the speaker believes that the journey the listener is currently on is something wonderful and that the opportunity to undertake such a journey is very rare indeed.
perhaps by saying 'a thousand lifetimes' instead of simply 'a lifetime' the speaker was trying to add emphasis to this already very strong expression.
Student or Learner