What is the total length of this roll of foam/

Answer:

Bill, I am not showing the exact length listed at this time, but do show "enough to use on multiple cooktops" Can you get back to us via email with the Model and Serial Numbers of the appliance you need to use this for so we can try to verify for sure if this will work for what you are needing? Kind Regards, Customer Support ✨ Supplying Demand