I have one practitioner who has 15 minute sessions and another 20 minutes. Is it possible to set up the diary so they can both be catered for and the reception staff can easily switch from one to the other without changing settings in Diary Options?
In answer to your post, yes this is possible. Simply right-click on the diary time ruler to the left of the diary, and a list of pre-defined time intervals will appear. You can use this to quickly jump between intervals without having to change the default setting.