My nearly correct answer was "à 2 heures de Chartes". Why was it not completely correct?
By the way, according to the BIPM (Bureau International des Poids et Mesures), the official way to abbreviate "2 heures" is not "2h" but rather "2 h" with a space. See page 149 of
chrome-extension://efaidnbmnnnibpcajpcglclefindmkaj/https://www.bipm.org/documents/20126/41483022/SI-Brochure-9-EN.pdf