At one point, I was required by my job to have licenses in all surrounding states to MN as well as MN when I was a regional assigned pharmacist in Civil Service (and my moonlighting job at Walgreens required a CA, FL, OH, NY, and IL license for strikebreaking if it came to it). That, and I'm still oversight over the IG section for regulatory analysis and get summaries and comparisons from the IG legal staff weekly which I still read. I get reimbursed for those 18 licenses such that the burden is just keeping the CE in order which is a joke due to my job and BCNP requirements.
Since I use none of them now in my day to day, I've considered letting all but three go, but I get reimbursed and get 120 additional hours a year off to deal with the requirements.
That, and my memory doesn't suck. One of my unofficial jobs in the civil service is to be an institutional memory for unofficial policymaking and personnel.