Tony,
I was good with 1 on my butane and old Sea Cook stoves. I've had a 2 burner on a 35' boat and a 3 burner on a 41' and used 2 at a time then but that was living aboard with wife and daughter.
1 burner is fine for 1 pot meals or side dishes to go with the BBQ.
My 8 minute result with the alcohol stove wasn't much slower than our house stove with natural gas. I haven't cooked anything on it yet.
edit: liveaboard boats were both propane.
I was good with 1 on my butane and old Sea Cook stoves. I've had a 2 burner on a 35' boat and a 3 burner on a 41' and used 2 at a time then but that was living aboard with wife and daughter.
1 burner is fine for 1 pot meals or side dishes to go with the BBQ.
My 8 minute result with the alcohol stove wasn't much slower than our house stove with natural gas. I haven't cooked anything on it yet.
edit: liveaboard boats were both propane.