FOR

DURING - WHILE

WHEN -WHILE

Forshows how long something happened. It is used to refer to a period of time.

Both during and while refer to a period of time in which something happens.

When and while can both be used when two things happen at the same time. 

During is used with a noun .

While is used with a subject and verb. 

When is used when two short events happen at the same time.

OR

When a short event interrupts a continous action

While is used when two continuous actions happen at the same time.

OR

When a continuous action is interrupted by a short event

She's in New York for a few days.

We were busy during the weekend. 

We went shopping while you were sleeping. 

I heard you when you opened the door. 

I was listening to music when the phone rang

'While you were studying I went out shopping

The phone rang while I was listening to music