I hike solo a lot, but it is usually less that 5 days. This year I'm hiking the JMT solo taking 21-22 days. The advantage to the JMT is that I do not have to be alone while having complete freedom to do whatever I feel like doing on any given day. I am sure there will be times when I will be lonely, but I am actually looking forward to those times as I am sure that they will be the times when God can have my undivided attention. plus, it's not like you are ever alone on the JMT.
Now, spending 5 days off trail in Emigrant and seeing only one person from a distance...that is alone... and I LOVED it!
Just an old newbe