TiDi
It's real now, apparently.

https://www.telegraph.co.uk/technology/news/10697529/Prisoners-could-serve-1000-year-sentence-in-eight-hours.html

This technology could be used for scientific or medical advancements, but instead we're using it for TiDi.

"Uploading the mind of a convicted criminal and running it a million times faster than normal would enable the uploaded criminal to serve a 1,000 year sentence in eight-and-a-half hours. This would, obviously, be much cheaper for the taxpayer than extending criminals’ lifespans to enable them to serve 1,000 years in real time."

It's kind of horrifying that that's the argument being posed