14 day limit - how many nights?

[tx2sturgis]

Ok, yeah if you are given a written permit that expires on the 15th day, then that is 14 nights. Or if they write up a permit for 14 nights, then that is 15 days.

But the original question is about 14 days on BLM or NF land.

So I'm thinking that will probably mean 13 nights and 14 days.

That's how I would assume a ranger would interpret it.