just did the same trip this week, first go to keran night stay there, take a jeep and go to ratti gali, stay at sharda that night. next day go to kel, trek to arang kel is max 45 minutes, stay at kel tjat day. The way to Taobut is under construction they are using dynamites and way only opens for sometime in a day so tabut is not advisable, instead of going to taobut we visited to shounter lake and stayed at sharda again that day.