Hi Elizabeth. It’s a good sentence, although it’s past continuous not present.

Correct sentence: "I was playing the piano for 3 hours yesterday." This uses the past continuous (was playing) + duration (for 3 hours), and it’s fine. Here's why: The past continuous describes an action that was in progress at a specific time in the past. The phrase “for 3 hours” gives us the duration of the activity. “Yesterday” gives us the time reference. So, you're saying: At some point yesterday, I was in the middle of playing the piano, and it lasted 3 hours. 🟡 Alternative – also correct: "I played the piano for 3 hours yesterday." This uses the past simple to describe a finished action and is more direct. Use this if you’re just telling someone what you did, without focusing on it being in progress. 🟠 Would past perfect work? "I had been playing the piano for 3 hours..." This form (past perfect continuous) is only correct if you're setting up another event afterward, like: I had been playing the piano for 3 hours when the neighbors complained. So it requires a second event to justify the past perfect. In summary: "I was playing the piano for 3 hours yesterday." Correct. Focuses on the action in progress. "I played the piano for 3 hours yesterday." Also correct. More direct. "I had been playing..." Only use if it connects to another past event.

Ik that Piano doesn't take " the " before it!

That is just fine 🙂