In Timesync, you'll be able to block individual time slots and individual days as well.
Here are the steps you can do
1. Choose the meeting
2. Under Dashboard setting > Click Edit Meeting > Choose Availability
3. For instance, you want to block Tuesday and Thursday, set up the setting as follows.
Click Add Time to set your specific availability
4. Next, determine how many days it will be available on your booking page. It will help you to create recurring availability on your booking page. Scroll down till you find Schedule Days
5. Once you're done, click the Update button
The booking page will look like this
PS. You can block certain dates and times as well through google calendar if you integrate Timesync to your own Gmail/Outlook account. Timesync will automatically check and sync your availability