Where in the world are you flying, and at what speed, that you could be talking to the same agency for over an hour?
Belgium, 80 kts, Brussels information. Carefully navigating between the bits of controlled airspace, they are closed to me. I must have done more than 2 hours never talking to anyone else.
But I agree it could only be an AFIS. And the opening question seems little realistic to me, if it actually happened to me I might well respond "one hour, lady/sir, give or take as the winds will have it". I cannot imagine any operator asking time to overhead if it could be more than, say, half an hour.
So how would 1500 hrs be said over the radio?
How's about "Just before tea time, more or less" ?
(make that "JBTT+-" to be really English)
(sorry, I couldn't resist)