The Winds of Wisdom buff that increases Experience gains by 50% will return on October 4, making it an ideal time to level a new character for Dragonflight. The buff will be removed when Evokers become available for play.

Currently, the rumored launch date of the pre-patch is October 25.

(Source)

If you’re just returning after a hiatus from World of Warcraft, leveling another character (or two), or preparing to get ready for the Dragonflight expansion then this is the perfect time to jump into the game. Beginning the week of October 4 with each region’s local weekly reset, all World of Warcraft* players level 10-59 will gain the experience buff called “Winds of Wisdom,” which will increase experience gains by 50%!

Don’t delay. The winds will shift once more when the new dracthyr Evoker becomes playable during the Dragonflight pre-expansion patch, and the experience buff will no longer be available.

* Experience boost not available in World of Warcraft Classic titles.