system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How do unlimited vacation days at tech companies work?

My guess is that it's mostly a gimmick. I work for a tech company and already don't use all my vacation time. Could an employee really 'take a sabbatical' and tour around the world on full salary or is it mostly bunk?
gpt
It's mostly bunk. You need to get manager approval for vacations, and there's social pressure not to take long vacations. All the studies that looked at it show that people at companies with unlimited vacation tend to take less time off than those with limited vacation.