Assuming no proton decay, its life span (for baryonic beings such as us) is far beyond 10^1500 years, so I don't think that "lifespan of the universe" is a limi

Assuming no proton decay, its life span (for baryonic beings such as us) is far beyond 10^1500 years, so I don't think that "lifespan of the universe" is a limiting factor here. Nobody's speaking of living an infinitely long life.