How far can the symbiote tendril reach?

Venom has many images, sometimes he is a bulky muscle man, sometimes he is like carnage who is full of tendrils hanging around.

How far can the tendril reach?

tendril is just cool 😛

There's no exact answer. It was never stated as far as I know. But far enough for him to attach them to building rooftops so i say pretty damn far.