Brew time is pretty much precisely 6 minutes.
Set pot on stove, set timer. When bell rings, coffee is ready.
(A timer built into your cooker / microwave can also work, I find their alarms are not loud enough.)
The surface area of the pot bottom is the limiting factor more than anything else.
Sure, low heat and widely-divergent hobs exist. Standards and conventions help ensure reasonable convergence.
Brew time is pretty much precisely 6 minutes.
Set pot on stove, set timer. When bell rings, coffee is ready.
(A timer built into your cooker / microwave can also work, I find their alarms are not loud enough.)