I am a research intern in the summer. I will be investigating my own research topic. I am planning to volunteer (not being paid) at the lab two months earlier for approximately 20 hours a week during that period - then I will be working 40 hours.
Is it reasonable to say under my 'experience' header of my resume that I've been there for:
X minus 2 months to present?
or should I say only:
X to present?