We published the starting times of each categorie here:

ESF – Swiss Junior Open 2022 – Organization (tournamentsoftware.com)

Thursday
– 16.00 Gu15 and Gu19
– 16.30 Bu15
– 17.30 Bu17
– 18.00 Bu19
– 18.30 Gu17

Friday
– 09.00 Gu13
– 09.30 Bu13