You have given us no information. How could we possibly know.
"Hey Lama, hey, how about a little something, you know, for the effort." And he says, "there won't be any money, but when you die, on your deathbed, you will receive total consciousness." So I got that goin' for me, which is nice. - Carl Spackler
There is no average run time, as the run time is entirely dependent on the load, which varies from day to day, and hour to hour within each day.
Since it is a modulating furnace, with an upper capacity of 90k btuh and a lower capacity of 40k btuh, any time the load is greater than 40k btuh, it should run nearly continuously, modulating the capacity as the load dictates.
If the load is under 40k btuh, it will cycle on and off like any other furnace.
If more government is the answer, then it's a really stupid question.