It should be pretty quick. You then end up with last year's tax return. You need to review it verify accuracy. Later this month or early next month you can start to proforma to next year and patiently wait for the 2024 to be fully functional. 

Here is the article on conversion

To check the status of your data conversions:

1. Click Settings in the upper right corner.
2. Under Tools select Convert Data.

The conversion Dashboard will display your current and previous conversions along with a status.