The normal amount (70-80+ years)

Around a century (90-120+ years)

A few centuries (150-300+ years)

Half a millennium or more (500-750+ years)

A small eternity (1,000-5,000+ years)

A big eternity (10,000-500,000+ years)

An eon or two (1,000,000-1,000,000,000+ years)

Until the galaxies merge and our sun explodes (3-5 billion+ years)

Until there's nothing interesting left to see (up to 10^100 years)

I want to be eternally ∞