How long has your brother been out of
work?​

Як довго твій брат працює(укр)?

Как долго твой брат работает(рус)?

Я не могу понять, что тут нужно... Но если вдруг, вам нужен выдуманный ответ, то вот:

My brother has not been working for a long time, because he is all in his studies. He is now studying to be a neural network development specialist. But soon, he will be able to work in his specialty.