what is the longest period of time a snow blizzard could last for and how are they formed ?

Question: what is the longest period of time a snow blizzard could last for and how are they formed ?
- Keywords:
  blizzard,
  snow
Asked by 646amem22 to Sarah, Sophie, Breandan on 2 Mar 2018. This question was also asked by Jasaiya, Rowan O'Doherty, 294amem22.
- anon answered on 2 Mar 2018:
  
  Sorry I don’t know – I’m not a meteorologist!
- Sophie Williams answered on 6 Mar 2018:
  
  I don’t know sorry!

Question: what is the longest period of time a snow blizzard could last for and how are they formed ?