postman’s holiday
n.— «Wolfley devoted little time to anything outside his work. Even his sight-seeing verged on the “postman’s holiday,” for his walks usually ended at the Cluny Museum, where he examined Guillaume Dupuytren’s medical collection, or at the cemetery of Pere Lachaise or the Morgue.» —“An Ohio Surgeon In Paris, 1835-1836″ by Philip D. Jordan Ohio History July, 1940. (source: Double-Tongued Dictionary)