This grid is from the Japanese wiki.
It might not be 100% accurate.
|8:00||Cleaning in the Living Area|
|13:00||Deciphering Documents upstairs in the Living Area|
|16:00||Outside the Observatory|
|17:00||On the Roof||Dinner|
|19:00||Embroidery or watching fireflies or on the Roof|
|20:00||Watching the fireflies in the Courtyard or on the Roof||Courtyard|
|21:00||Writing in her diary|
|23:00||Preparing for Bed|
|0:00-6:00||Sleep||In front of the table in the Living Area|
If you give Elena the Pure tealeaves she maybe drinking tea at the table at 15:00.