Uzbek Embassy in Bishkek - Booking appointments

Hi, I need to get my UZ visa from the embassy in Bishkek on a Tuesday. I will have a LOI. How do I ensure that I get a Tuesday appointment?

The typical advice is to call the day before, but I see two recent reports on Caravanistan where people called on Monday afternoon and were given Wednesday appointments:

viewtopic.php?f=3&t=456&p=1189

viewtopic.php?f=3&t=299&p=728

When should I call to make sure that I will be given a Tuesday appointment?

Thanks!