Time Window Estimates - Automated Defaults

Hello,

We have been using the Home Visit feature and doing automated routing, it works quite well, however the 4 hour windows that the system gives by default is quite a wide range that we would like to be reduced without having the manually do this every day.
I.E. instead of 4 hour windows, it could be default of either 2 or 3 hour windows.

This honestly would be extremely helpful if so.
Thanks!