MVP timer
18 of the 24 MVP bosses in Zero have a respawn time on file. Note when you killed one — the timer works out the window and keeps counting while the page is open.
A window, not a point in time The time consists of a fixed base plus a random addition — which is why a range is shown, never a single moment. And these are rAthena renewal values: they are not confirmed for Ragnarok Zero, just like health and experience, where the comparison did show deviations. Measuring in game beats this. A server restart respawns the bosses anyway.
The times you enter stay in this browser and are sent nowhere. They are not there on another device.
Source data as JSON at /api/mvp.json — 6 bosses have no time on file; they are listed below without a timer.