Well folks, the time required for Stüdlgrat depends on:
1. the general conditions on the arete, wether there is snow or not, wether you have to climb with crampons or not etc.
2. your aptitude and efficiency to master an high alpine arete with mixed rock and snow / ice up to UIAA grade III with all the rappeling work
3. the amount and the aptitude / efficiency of the climbers in front of you and consequently the time you have to wait until the parties in front of you move on.
Stüdlgrat is a great route !!!!
Stüdlhütte is a great mountain hut.
I don´t know what you folks are talking about "not cheap" or "too expensive" or whatever. Nearly no hut keeper can make a living out of his hut. It is open only a short period in the year. There are sufficient guests only in the good weather periods. It is a remote, high alpine place where the hut is erected. You have high transportation costs for everything. You have high costs for supply. You have high maintenance costs. You have high costs for sewerage, energy and waste.
Nearly every mountain hut is a loss-making business. And all those families running a mountain hut as a sort of side job are highly engaged people to do so. They keep the huts and their surroundings in a good shape. And normally they are involved in rescuing people if an emergency occurs.
It´s the people and not the hut who are noisy and egoistic and do not respect that there are other people who want to sleep. So tell those people to shut up instead of avoiding huts.
I don´t mean that harshly but in my opinion you should think about that, too!
Cheers and good luck on the Stüdlgrat, Michael