Unfortunately, how long acclimatization lasts falls under the category of every "body" is different. Some people -- such as myself -- find that a good night's sleep is more important than actually battling it out "at elevation" the night before (so that I have a nice comfortable pace up the hill with no effects, whilst the "acclimatized" person wanders up the hill sleep deprived with a headache)Sleeping at Gorgonio the weekend before might help, as many claim that the benefits of elevation will last 5 days or longer. The second most important factor if one cannot sleep at elevation (probably the first most important, but many will disagree)for acclimatization is a good night's sleep before the hike.
