UK T4 visa, how long does it take from receiving the email to getting the passport back?

The key is whether the passport has been returned to the visa application center.

When the visa result comes out, it means that the visa office of the Beijing Embassy has reviewed the application materials and issued the visa result, but the passport may not have been returned to the visa application center.

Generally speaking, you can get your passport on Friday. You can go to the visa center to pick it up. If it is not available, you can also confirm with the visa center and arrange to pick it up at the Beijing embassy.