This page of the guide to The Witcher Monster Slayer contains a detailed walkthrough of the Will O' The Wisp quest available in the game.
Rewards: 250 XP, 100 gold coins.
The Will O' the Wisp quest begins when you reach the first point on the map. This quest will unlock only when you complete the first four quests available in the game (Final Exam, Winged Bandit, A Joint Venture, Good Money).
The task is to reach the 3 points indicated on the map. At the very end, you will receive a reward: gold coins and experience points.
You have to get to each location within a time limit. You must move as fast as possible to reach the next point in less than 15 minutes. This will complete the task.
Repeating the quest
This quest currently cannot be repeated. If you don't make it in time, you simply won't get access to it and, therefore, won't get the rewards.