You'll have to fine to the cook times to suit your taste. (trial and error)
I'm at 45 feet above sea level.
For us with (Maxwell house or the like):
Once we fill the pot with water it takes roughly 8 minutes to begin percolating and then I let it run about 7- 8 more minutes. My wife pours her cup then puts it back on the stove . I let it brew for another 3 minutes. before I pour mine.
There is something about cooked coffee that tastes so good.
If you need coffee in 5 minutes this is not the way to go.