The trick here is to convey that you won't burn out easily in this position. Communicate that you understand what they expect of you and that you understand that this aspect of the job is difficult and more arduous than it seems. Communicating an equivalent experience will go a long way here. Draw correlations between your work experience and the expectations of the position you're contending for. Once you've mapped those out, describe your relevant work experience with adhering to a regimented, monotonous routine. Next, offer your understanding of what the position you are interviewing for looks like. Then, ask for further clarification of what the position entails, beyond what they advertise in the job description, regarding the routine. Further, elaborate on how your experience correlates with the expectations of the job.

"I get that a lot of people have trouble performing that kind of work without burning out. I'm indifferent to that part of the job. I take pride in my work, no matter what I'm doing, and have several systems and processes for every aspect of what I do. When you are good at what you do, you enjoy the work."