I'm a bit confused how to use WFO Cycles.

In the manual there are some hints to use around 10 Cycles regardless the complete WFO Period in years for Maschine learning.

Some other point out that the WFO Cycles should be customized for the number of years used for the WFO.

What would be the best calculation or number for WFO Cycles used for Maschine learning in Zorro ?

Another question would be the ratio for test and Train. Did a ratio of 20:80 produce a more accurate Result in Live Trading compare to 10:90 ?