The friends that we plan to hike Whitney with on the 4th of July (permit allowing, of course) can't drive up from San Diego till the 3rd of July. They're suggesting that we acclimate on San Gorgonio the previous weekend. All the data I can find online explains how to acclimate once we head into higher elevations, but not how long those effects will last once we return to sea level. Is our friends' plan a reasonable one?
