My girlfriend and I just did this and its was very difficult and dangerous coming from Harvard to Colombia. The route to Harvard was decent and accurate however: the decent from Harvard over to Colombia is not marked and it's very difficulty to locate a trail. We did tons of bouldering and sliding down very steep talus and loose rocks at 1 point I was very afraid I was going to get hurt and fall because the rocks are incredible loose. We were very lucky to make it to the top to Colombia and had very good weather but I am warning everyone to really consider not doing these 2 in the same day because of how dangerous the rock slides are to get over from Harvard to Colombia.
We met some really nice hikers and had great company. The total hike took us 14 hours to complete and lucky enough we camp in the night before. Feel free to message me if you have additional questions I can answer.
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