As @Jamie21 has said before, you begin to recognize patterns. The majority of times, testers are looking for a warm body to talk to, not an actual appointment. So I’ll engage them for a bit, but once I realize it’s going nowhere, I’ll wrap it up or stop responding.
As most everything in this forum goes, it varies from provider to provider MF scenario to scenario.
My general rule (unless it is a regular before I got sick) is the driving distance is not longer than the appointment time.
That being said, if you want to ensure they’ll come, you may want to compensate for driving time beforehand. Even if they don’t, you’re only out that expense.
But what do I know!