We / 30 minutes
We have been going bowling for 30 minutes.
They / February
They have been doing boxing since February
You / you were a child
You have been playing golf since you were a child.
They / 7 years
They have been playing football for seven years
He / 10:00 AM today
He has been doing karate/judo since 10 AM today.
She / she left school.
She has been going running since she left school.
She / she was 10 years old.
She has been going snowboarding since she was 10 years old.
He / March
He has been doing yoga since March
I / 5 years ago.
I have been playing table tennis since five years ago.
We / a long time
We have been playing basketball for a long time.
I / 12 years.
I have been playing baseball for twelve years.
I / two months.
I have been doing weigh lifting for two months.
She / 7 months
She has been doing archery for seven months
They / a long time
They have been skiing for a long time.
The dinosaur / five minutes ago
The dinosaur has been going ice skating since five minutes ago.
She / 2005
She has been going rock climbing since 2005