Jeff, very doable, and very enjoyable.
Last time I did it, we took 5, but we hiked in the first evening to Chickenspring Lake. That may have been a mistake for some in my party, who got altitude illness.
The next day to Rock creek was relatively short, as it was level/downhill, after climbing out of the Lake, and could easily been combined.
Next day to Guitar Lake Tarns seemed long, but was just a matter of walking gradually uphill.
We camped at Trail Camp after summitting, but could have walked out that day, also. That would have made it 3 days.
I think your mileage is off, though, as I don't think it is 60 miles, more like 36.
http://www.trails.com/tcatalog_trail.aspx?trailid=BGS121-028
