Your national accrediting body determines the amount of training time that can be missed each year to be eligible to sit for your board certification.  If you are allowed 6 weeks each year, that is what you are entitled to under the contract.  It is up to you to know this.  Some lengthy programs allow for more time off during the last one or two years of your training.

Paragraph 75 of the CBA states, "An employee whose national accrediting body training program requirements or non-University sponsor prescribe the amount of time off for vacation shall be entitled to that amount of vacation."

If you are entitled to do research, you need to make sure that's included in your program's curriculum.  You are appointed as a clinical trainee and the goal is to become board eligible (and pass your boards).  Please familiarize yourself with these ever-changing requirements.