It's not possible.
"Your first time, you must make the warzones in ascending order and be inside the boss's room when he is defeated, this means that if you leave the boss's room before the team defeats him, you will have to repeat the warzone again after 20 hours to go to the next one."
Bigfoot's Burden Quest - Tibia Wiki
Loqhakk - Applying to TibiaQA team as ModeratorJuly 26, 2024
Nareull - Applying to TibiaQA team as ModeratorJuly 14, 2024
Looking for new TibiaQA staff membersJuly 12, 2024