Generally, we only walk to the rose garden and back in about 15 minutes.
Today, in order to get up to 80%, I guessed it might take a half hour. A Tesla pulled in at the other charger. I do not know if having another car charging next door slows them down or not. Regardless, we knew we had extra time, so we walked along First Street, cut through the picnic and kids' area, and proceeded to Sixth Street. Then, we took the bike/walking path that passes behind Centennial Lodge and back over towards the chargers. The loop was at least a couple of kilometers.
The car was only at 78% charge, but that was certainly enough. Our tiny hike took us exactly 34 minutes. I didn't think to take any pictures. However, I dipped into my Flickr collection and found this one from 2005.