The full statement from developer MihoYo says that the event will run until February 25 at 11:59 p.m. UTC. Immediately following the event’s end, the Genshin Impact team will start to “finalize” the winners on February 26 from 12:00 a.m UTC to 7:59 p.m. UTC. All players who successfully lit all five in-game kinds of Xiao Lanterns with an Adventure Rank of at least ten will be looked at by the team and approved for the payout. Players who’ve met the necessary requirements will receive their portion of the 1 billion Primogem payout between 8:00 p.m. UTC February 26 and 11:59 p.m. UTC March 4.