Depends on the period in the war, the US was the only power that actually extended training as the war went on.
Brits cut their training to 200 hours until 42’ when they started getting enough fuel then it increased to 340 hours.
American Army Air Force in 42’ were 270 hours, raised in 43’ to 320 then 360 in 1944.
Navy pilots took longer.
“Navy pilots took longer.”
It takes some time to get up the courage to land on a boat.