From March 30 to April 6, the Double Experience promotion will undergo in Caliber. On these days, for each round, checkpoint, or milestone taken in Clearing, Showdown, Special Operation, Frontline, and Ranked Battles, the player will receive double the amount of experience. In addition, double experience for the duration of the event is credited to the account.
Nothing complicated: you play for the same time and upgrade twice as fast. The promotion will run until the start of maintenance on Wednesday, April 6.
The amount of experience during the event is shown in the pics.