Advent calendar

I must have touched hubby's Christmas nerve by presenting him with the Advent calendar I made for him. While still at work I received a text from him with the words "I have a surprise for you!". Coming home from work early he had gone to the mall and done some shopping, so when I came home I found the most lovely Advent calendar ever:

 

He went to my favorite tea shop (tea being my biggest passion right after beauty products) and bought lots of small baggies of tea, pralines and cookies.

I am a bit confused about this one though:

When am I supposed to open this???