YOU SAID:

I've been playing this game for over an hour

INTO JAPANESE

私はこのゲームを1時間以上プレイしています

BACK INTO ENGLISH

I have played this game for over an hour

INTO JAPANESE

このゲームを1時間以上プレイしました

BACK INTO ENGLISH

Played this game for over an hour

INTO JAPANESE

このゲームを1時間以上プレイした

BACK INTO ENGLISH

Played this game for over an hour