How long does it take to lose a skill I've developed masively?

The time it takes to lose a skill can vary widely depending on several factors, including the complexity of the skill, how frequently it was practiced, and individual differences in retention. Generally, skills can begin to diminish after just a few weeks of disuse, with more complex skills potentially fading faster. Regular practice and reinforcement are key to maintaining proficiency. Ultimately, the duration of skill retention can differ significantly from person to person.