I recently left a job that has a proxy. I would estimate the my time spent there working on proxy related issues to be more than 2 months over the 5 years I was

I recently left a job that has a proxy. I would estimate the my time spent there working on proxy related issues to be more than 2 months over the 5 years I was there. Is it too unreasonable to evaluate the cost of these proxies beyond the maintenance cost?