We jogged along the outer perimeter of Bonifacio High Street and I managed to go for 3 rounds which BTW, if you're not in the inner lane seeing all the burgis shops, can be particularly exhausting. By "jogging," I meant 1 full round of jogging, 1.5 round brisk walking, and jogged/sprinted the final half.
Top view of track (in red)
Bonus: I had pinakbet for lunch! McSpaghetti for dinner...The Fort does not offer you that many cheap choices at night...