Is there any calculator for ack time? most of my links are below 5 km, so I am using indoors settings...Shoud I use otherwise?

Is there any calculator for ack time? most of my links are below 5 km, so I am using indoors settings...Shoud I use otherwise?

At some point in the software revisions setting ack-time to dynamic for outdoor links started to work. I would not use indoors as that would be for links of <100 meters.