Maybe you're confusing the test time with the time for training?

Training two cycles takes about twice the time than training only one cycle. At least that's what I would normally expect. I do not really understand your problem.

In the manual under "NumWFOCylces" you can find a description what WFO does and how the period is divided into overlapping training and test cycles. The green bars in the image are the training periods. The more green bars and the longer they are, the more time needs your computer for the training.