Time Dilation combined with this concept interests me. 5 minutes IRL could be 2,000 or even 20,000 years lived as relative reality in relative time. Those years, and that life, would be 100% real to only you. 5 senses. Same concept as the Matrix, only this isn’t fiction. It’s in development. This makes more sense than trying to extend one’s lifespan with medicine or anti-aging tech. If those games were networked, you could spend those 20,000 years with your family and friends.
Of course, this could also be used to have criminals serve every year of those ridiculously stacked multiple life sentences they sometimes get. If a Judge sentences you to 10,000 years in Prison, those years would be served before the trial was over. The Prisoner would most likely be screaming and speaking in an unknown language by then, having evolved into a completely different person several times. But the tradeoff for that level of punishment should be a cleared record, and complete reintegration into society. It’s not even the same person that hurt your family anymore.