Manager: So you like caving?
Me: Yeah, I was able to go on a month long expedition last
summer to the mountains of Peru.
Manager: I can't believe your old job didn't fire you for taking a month off.
Me: I gave a lot of notice and had the vacation saved up.
Manager: That would never happen here. I have a problem leaving for a week.
In retrospect, I really appreciated the honesty. Declined that offer without hesitation.
They could easily threaten or guilt trip you when asking for a month off... If they would actually follow through is another question