How long have you been working on the mini rocket thruster?

Question: How long have you been working on the mini rocket thruster?
- Keywords:
  mini,
  rocket,
  thruster
Asked by aashishkebab to Charlie on 14 Mar 2011.
- Charlie Ryan answered on 14 Mar 2011:
  
  Hi thanks for the Q!
  about 4 and a half years – which yes is quite a long time! I did my PhD in it (although more the physics of it rather than the testing of it), and now i’m very busy in completing full tests on it.
  I guess 4 and a half years isn’t too long – my dad had the same job for about 30 years!

Question: How long have you been working on the mini rocket thruster?