Earlier quoted context omitted.
That's not how it really works out at Heroku. Our managers and vibe team really push us all to take at least a few weeks (3-4) off per year at a minimum. That's important because we all love our work so much that we work hard the rest of the time.
I think his point was that there's some unwritten upper bound, like say, 16 weeks. Would be easier to just tell me what the upper bound is, so I can take that, rather than under utilize my vacation days or offend the unwritten rule.
My experience is that when you genuinely and truly love where you work, "under-utilizing" vacation doesn't really come into the equation