Two minutes is the longest you could survive without a space...

Two minutes is the longest you could survive without a space suit on the other planets in our solar system. 

On Mars and Mercury, you’d stay alive for as long as you can hold your breath (about 2 min), and Venus is so hot that you’d instantly be vaporized. 

But just like Jupiter, Saturn, and Neptune, Uranus is a gas giant with no surface to land on - so you’d descend forever into the gassy atmosphere until you’re crushed by the pressure, which takes less than a second to kill you. 

(Source, Source 2)

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