How long does it usually take for a Taobao store to be effective?

It's not certain. It has nothing to do with time. It depends on whether you can run the business.

Some people may start to have real sales in just one week, but some people may spend money and time for a month and get nothing. These situations are all normal.

If you want to build a Taobao store in the shortest time and with the least money, you must lay a good foundation in the early stage.