how long can you survive on mars ?

Question: how long can you survive on mars ?
- Keywords:
  life,
  Mars,
  planet,
  survive
Asked by anon-191638 to Adam, Kathryn on 9 Nov 2018. This question was also asked by anon-191590.
- Adam McGuinness answered on 9 Nov 2018:
  
  Just me, by myself? I reckon around 15 seconds before I suffocate because there’s no air! But if you mean if NASA were sending me there, I still think it will be quite a while until we can create enough air and water to live there.
- Kathryn answered on 10 Nov 2018:
  
  On your own, you would not survive on Mars. With support you could survive for as long as you wanted as long as you have supplied of oxygen water and food

Question: how long can you survive on mars ?