Mink is bang on target. Have an out, especially if you are new at this. Ask about the operation, IN DETAIL. You want to know if it is a "managed" plane thru Jet or EJUM; if so, does the owner charter it. If so, details. If it's chartered, you may find yourself flying 20+ days some months. Or, the owner might charter it to his extended family for Christmas EVERY year. If it is true corporate plane (Fortune 100) there are some stability, but plenty of private owners are also wedded to having a plane--ask about ownership, type of use, international ops (do they have a Jepp or UVAir contract) or is each trip a "science project" for you.
There are large-cabin bizjets that cruise NYC-PBI every weekend and there are some that spend all summer in Nice or South America, you want to know which it is.
GF