Although it's not mentioned explicitly on the resume, we sometimes write something like "ABC professional with N years experience" on Linkedin or other online professional profiles or career development websites - sometimes also on a cover letter.
I have worked independently since high school age, throughout and after university for a total of 12 years; only four years after graduating I joined a major corporation as a junior manager in the same field. While there was an obvious difference between the scale and workload of my part-time/independent work and my full-time work, the actual content and learning has been equally relevant. In such a situation, would it be correct to say "Web design professional with 14 years experience"? And could I still apply for a position requiring 5+ years of experience as a designer, even though I have only 2 years within a corporation?
Would I need to be meticulous and count the exact days and hours I worked or is it sufficient to count from the year I started doing work, regardless of the actual hours I worked?
Would your answer depend on the specific industry and profession?
I am aware of a few very similar questions, though what distinguishes mine is that I look for a proactive way to demystify any prejudice about my years of working solo.