Someone domesticated foxes in 20 years https://en.wikipedia.org/wiki/Domesticated_silver_fox https://en.wikipedia.org/wiki/Domesticated_silver_fox , so perhaps

Someone domesticated foxes in 20 years https://en.wikipedia.org/wiki/Domesticated_silver_fox https://en.wikipedia.org/wiki/Domesticated_silver_fox , so perhaps it's possible to domesticate bumblebee in a few decades - but unlikely to be worth it.