If I open weekly task on tuesday, it will reset on monday or tuesday?

Question

I don't know if the seven days are from when I open or it closes the same day for everyone.

Answer 1

The time to complete the weekly tasks ends for everyone on the same day (before Monday's server save), regardless of the day you decide to start them.

Answer 2

Regardless of whether you start a weekly task on Tuesday, Friday, or any other day, weekly tasks reset automatically every Monday for everyone.

The seven day duration does not depend on when you open the task; instead, all weekly tasks are tied to a global weekly reset.

From the Tibia Wiki:

“Every week, resetting on Mondays, players will reroll which weekly tasks are available for them...”

Source:
https://tibia.fandom.com/wiki/Task_Board