How long have you been doing what your doing?

Question: How long have you been doing what your doing?
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Asked by Samuel Jackson to Roisin on 13 Nov 2016.
- Roisin Jones answered on 13 Nov 2016:
  
  Well, at the moment I’m working towards my PhD in organic chemistry, which I’ve been doing since September 2012! If you’re asking more generally about science, I started my undergraduate degree in chemistry in September 2008, and before that I did various science subjects as a teenager during secondary school.

Question: How long have you been doing what your doing?