Ideas on boosting speed for multi-color printing with AMS

I have a question regarding load/unload time in Bambu Studio, I have shortened the PTFE tubes like you mentioned but how do I measure the actual load/unload times to change them in the machine settings and get accurate predicted print time.

At the moment the slicer is predicting about 13.5h for one of my prints but in reality it took about 10h (with 2 pauses).

The slicer settings for load and unload are 29s and 28s if I start counting from when the filament starts to load/unload it’s about 7s and 6s. If I try these values then the time is way off (A lot less than the actual time). So, I’m not sure what is meant by these values.