It is not about time spent on training, it is about progress. In Aikido, you practice bokken techniques from 100 years ago, as they were trained in old ryu schools. Kendo is modern competitive martial art, where many old techniques died because they are not efficient in actual fight.

If Aikido schools would adapt even basic but modern kendo footsteps and strikes, Aikido practicioners would have much better view on efficient sword fight.