Which route you decide on should be determined by a number of factors, including the general fitness and experience of your hiking group, how much time you have as well as the time of year that you are hiking.
This route allows for good acclimatization as hikers can use the “climb high, sleep low” maxim, climbing back down between the base camps to sleep at a lower altitude.
A minimum six days is required, but eight to nine is recommended, allowing lots of time to acclimatize, and as a result this route offers a high success rate.
It’s also a good idea to get a heart rate monitor and learn how to keep your heart rate lower to avoid being out of breath on the mountain.