It takes me a couple hours to watch a movie, a couple days to read a book. I can re-watch the movie or re-read the book, and enjoy them again even though I already have. The plots won't change; they are predetermined; nonetheless, I am entertained on repeat consumption.
A suitably advanced entity could do the same: consume the entirety of my life (for whatever purpose, entertainment), its trials and tribulations, as easily as I do a book or a movie. A century of time would be a small nothing to an entity who could intake 100 quadrillion fps to my 35 fps. It could "play" my life for its amusement as easily as I play a DVD.
That said, the experience of déja vu, re: predetermination, will never stop giving me the creeps.